Remove old example address book

Removed because it was one of the very old tutorials and currently there are many other examples that covers what this tutorial shows. Also there is not a corresponding example on the qt docs.

Pick-to: 6.8
Change-Id: I4be1ef3e27827a19d13d6cbe168fda5e7f8a01c5
Reviewed-by: Friedemann Kleint <[email protected]>

10 files changed, 0 insertions, 1855 deletions

diff --git a/examples/widgets/tutorials/addressbook/addressbook.pyproject b/examples/widgets/tutorials/addressbook/addressbook.pyproject
deleted file mode 100644
index 13d739e1b..000000000
--- a/examples/widgets/tutorials/addressbook/addressbook.pyproject
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-    "files": ["part3.py", "part1.py", "part5.py", "part2.py",
-              "part7.py", "part6.py", "part4.py"]
-}
diff --git a/examples/widgets/tutorials/addressbook/doc/addressbook.png b/examples/widgets/tutorials/addressbook/doc/addressbook.png
deleted file mode 100644
index 7d563c17c..000000000
--- a/examples/widgets/tutorials/addressbook/doc/addressbook.png
+++ /dev/null
diff --git a/examples/widgets/tutorials/addressbook/doc/addressbook.rst b/examples/widgets/tutorials/addressbook/doc/addressbook.rst
deleted file mode 100644
index 646d949d2..000000000
--- a/examples/widgets/tutorials/addressbook/doc/addressbook.rst
+++ /dev/null
@@ -1,9 +0,0 @@
-Address Book Example
-====================
-
-The address book example shows how to use proxy models to display different
-views onto data from a single model.
-
-.. image:: addressbook.png
-   :width: 400
-   :alt: Address Book Screenshot
diff --git a/examples/widgets/tutorials/addressbook/part1.py b/examples/widgets/tutorials/addressbook/part1.py
deleted file mode 100644
index c3785f416..000000000
--- a/examples/widgets/tutorials/addressbook/part1.py
+++ /dev/null
@@ -1,39 +0,0 @@
-# Copyright (C) 2013 Riverbank Computing Limited.
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-from __future__ import annotations
-
-import sys
-
-from PySide6.QtCore import Qt
-from PySide6.QtWidgets import (QApplication, QGridLayout, QLabel, QLineEdit,
-                               QTextEdit, QWidget)
-
-
-class AddressBook(QWidget):
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        name_label = QLabel("Name:")
-        self._name_line = QLineEdit()
-
-        address_label = QLabel("Address:")
-        self._address_text = QTextEdit()
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(name_label, 0, 0)
-        main_layout.addWidget(self._name_line, 0, 1)
-        main_layout.addWidget(address_label, 1, 0, Qt.AlignmentFlag.AlignTop)
-        main_layout.addWidget(self._address_text, 1, 1)
-
-        self.setLayout(main_layout)
-        self.setWindowTitle("Simple Address Book")
-
-
-if __name__ == '__main__':
-    app = QApplication(sys.argv)
-
-    address_book = AddressBook()
-    address_book.show()
-
-    sys.exit(app.exec())
diff --git a/examples/widgets/tutorials/addressbook/part2.py b/examples/widgets/tutorials/addressbook/part2.py
deleted file mode 100644
index 04550871c..000000000
--- a/examples/widgets/tutorials/addressbook/part2.py
+++ /dev/null
@@ -1,146 +0,0 @@
-# Copyright (C) 2013 Riverbank Computing Limited.
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-from __future__ import annotations
-
-import sys
-
-from PySide6.QtCore import Qt
-from PySide6.QtWidgets import (QApplication, QGridLayout,
-                               QLabel, QLineEdit,
-                               QMessageBox, QPushButton, QTextEdit,
-                               QVBoxLayout, QWidget)
-
-
-class SortedDict(dict):
-    class Iterator:
-        def __init__(self, sorted_dict):
-            self._dict = sorted_dict
-            self._keys = sorted(self._dict.keys())
-            self._nr_items = len(self._keys)
-            self._idx = 0
-
-        def __iter__(self):
-            return self
-
-        def next(self):
-            if self._idx >= self._nr_items:
-                raise StopIteration
-
-            key = self._keys[self._idx]
-            value = self._dict[key]
-            self._idx += 1
-
-            return key, value
-
-        __next__ = next
-
-    def __iter__(self):
-        return SortedDict.Iterator(self)
-
-    iterkeys = __iter__
-
-
-class AddressBook(QWidget):
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        self.contacts = SortedDict()
-        self._old_name = ''
-        self._old_address = ''
-
-        name_label = QLabel("Name:")
-        self._name_line = QLineEdit()
-        self._name_line.setReadOnly(True)
-
-        address_label = QLabel("Address:")
-        self._address_text = QTextEdit()
-        self._address_text.setReadOnly(True)
-
-        self._add_button = QPushButton("&Add")
-        self._submit_button = QPushButton("&Submit")
-        self._submit_button.hide()
-        self._cancel_button = QPushButton("&Cancel")
-        self._cancel_button.hide()
-
-        self._add_button.clicked.connect(self.add_contact)
-        self._submit_button.clicked.connect(self.submit_contact)
-        self._cancel_button.clicked.connect(self.cancel)
-
-        button_layout_1 = QVBoxLayout()
-        button_layout_1.addWidget(self._add_button, Qt.AlignmentFlag.AlignTop)
-        button_layout_1.addWidget(self._submit_button)
-        button_layout_1.addWidget(self._cancel_button)
-        button_layout_1.addStretch()
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(name_label, 0, 0)
-        main_layout.addWidget(self._name_line, 0, 1)
-        main_layout.addWidget(address_label, 1, 0, Qt.AlignmentFlag.AlignTop)
-        main_layout.addWidget(self._address_text, 1, 1)
-        main_layout.addLayout(button_layout_1, 1, 2)
-
-        self.setLayout(main_layout)
-        self.setWindowTitle("Simple Address Book")
-
-    def add_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self._name_line.clear()
-        self._address_text.clear()
-
-        self._name_line.setReadOnly(False)
-        self._name_line.setFocus(Qt.FocusReason.OtherFocusReason)
-        self._address_text.setReadOnly(False)
-
-        self._add_button.setEnabled(False)
-        self._submit_button.show()
-        self._cancel_button.show()
-
-    def submit_contact(self):
-        name = self._name_line.text()
-        address = self._address_text.toPlainText()
-
-        if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
-            return
-
-        if name not in self.contacts:
-            self.contacts[name] = address
-            QMessageBox.information(self, "Add Successful",
-                                    f'"{name}" has been added to your address book.')
-        else:
-            QMessageBox.information(self, "Add Unsuccessful",
-                                    f'Sorry, "{name}" is already in your address book.')
-            return
-
-        if not self.contacts:
-            self._name_line.clear()
-            self._address_text.clear()
-
-        self._name_line.setReadOnly(True)
-        self._address_text.setReadOnly(True)
-        self._add_button.setEnabled(True)
-        self._submit_button.hide()
-        self._cancel_button.hide()
-
-    def cancel(self):
-        self._name_line.setText(self._old_name)
-        self._name_line.setReadOnly(True)
-
-        self._address_text.setText(self._old_address)
-        self._address_text.setReadOnly(True)
-
-        self._add_button.setEnabled(True)
-        self._submit_button.hide()
-        self._cancel_button.hide()
-
-
-if __name__ == '__main__':
-    app = QApplication(sys.argv)
-
-    address_book = AddressBook()
-    address_book.show()
-
-    sys.exit(app.exec())
diff --git a/examples/widgets/tutorials/addressbook/part3.py b/examples/widgets/tutorials/addressbook/part3.py
deleted file mode 100644
index 5083afcf3..000000000
--- a/examples/widgets/tutorials/addressbook/part3.py
+++ /dev/null
@@ -1,215 +0,0 @@
-# Copyright (C) 2013 Riverbank Computing Limited.
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-from __future__ import annotations
-
-import sys
-
-from PySide6.QtCore import Qt, Slot
-from PySide6.QtWidgets import (QApplication, QGridLayout,
-                               QHBoxLayout, QLabel, QLineEdit,
-                               QMessageBox, QPushButton, QTextEdit,
-                               QVBoxLayout, QWidget)
-
-
-class SortedDict(dict):
-    class Iterator:
-        def __init__(self, sorted_dict):
-            self._dict = sorted_dict
-            self._keys = sorted(self._dict.keys())
-            self._nr_items = len(self._keys)
-            self._idx = 0
-
-        def __iter__(self):
-            return self
-
-        def next(self):
-            if self._idx >= self._nr_items:
-                raise StopIteration
-
-            key = self._keys[self._idx]
-            value = self._dict[key]
-            self._idx += 1
-
-            return key, value
-
-        __next__ = next
-
-    def __iter__(self):
-        return SortedDict.Iterator(self)
-
-    iterkeys = __iter__
-
-
-class AddressBook(QWidget):
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        self.contacts = SortedDict()
-        self._old_name = ''
-        self._old_address = ''
-
-        name_label = QLabel("Name:")
-        self._name_line = QLineEdit()
-        self._name_line.setReadOnly(True)
-
-        address_label = QLabel("Address:")
-        self._address_text = QTextEdit()
-        self._address_text.setReadOnly(True)
-
-        self._add_button = QPushButton("&Add")
-        self._submit_button = QPushButton("&Submit")
-        self._submit_button.hide()
-        self._cancel_button = QPushButton("&Cancel")
-        self._cancel_button.hide()
-        self._next_button = QPushButton("&Next")
-        self._next_button.setEnabled(False)
-        self._previous_button = QPushButton("&Previous")
-        self._previous_button.setEnabled(False)
-
-        self._add_button.clicked.connect(self.add_contact)
-        self._submit_button.clicked.connect(self.submit_contact)
-        self._cancel_button.clicked.connect(self.cancel)
-        self._next_button.clicked.connect(self.next)
-        self._previous_button.clicked.connect(self.previous)
-
-        button_layout_1 = QVBoxLayout()
-        button_layout_1.addWidget(self._add_button, Qt.AlignmentFlag.AlignTop)
-        button_layout_1.addWidget(self._submit_button)
-        button_layout_1.addWidget(self._cancel_button)
-        button_layout_1.addStretch()
-
-        button_layout_2 = QHBoxLayout()
-        button_layout_2.addWidget(self._previous_button)
-        button_layout_2.addWidget(self._next_button)
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(name_label, 0, 0)
-        main_layout.addWidget(self._name_line, 0, 1)
-        main_layout.addWidget(address_label, 1, 0, Qt.AlignmentFlag.AlignTop)
-        main_layout.addWidget(self._address_text, 1, 1)
-        main_layout.addLayout(button_layout_1, 1, 2)
-        main_layout.addLayout(button_layout_2, 3, 1)
-
-        self.setLayout(main_layout)
-        self.setWindowTitle("Simple Address Book")
-
-    def add_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self._name_line.clear()
-        self._address_text.clear()
-
-        self._name_line.setReadOnly(False)
-        self._name_line.setFocus(Qt.FocusReason.OtherFocusReason)
-        self._address_text.setReadOnly(False)
-
-        self._add_button.setEnabled(False)
-        self._next_button.setEnabled(False)
-        self._previous_button.setEnabled(False)
-        self._submit_button.show()
-        self._cancel_button.show()
-
-    @Slot()
-    def submit_contact(self):
-        name = self._name_line.text()
-        address = self._address_text.toPlainText()
-
-        if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
-            return
-
-        if name not in self.contacts:
-            self.contacts[name] = address
-            QMessageBox.information(self, "Add Successful",
-                                    f'"{name}" has been added to your address book.')
-        else:
-            QMessageBox.information(self, "Add Unsuccessful",
-                                    f'Sorry, "{name}" is already in your address book.')
-            return
-
-        if not self.contacts:
-            self._name_line.clear()
-            self._address_text.clear()
-
-        self._name_line.setReadOnly(True)
-        self._address_text.setReadOnly(True)
-        self._add_button.setEnabled(True)
-
-        number = len(self.contacts)
-        self._next_button.setEnabled(number > 1)
-        self._previous_button.setEnabled(number > 1)
-
-        self._submit_button.hide()
-        self._cancel_button.hide()
-
-    @Slot()
-    def cancel(self):
-        self._name_line.setText(self._old_name)
-        self._address_text.setText(self._old_address)
-
-        if not self.contacts:
-            self._name_line.clear()
-            self._address_text.clear()
-
-        self._name_line.setReadOnly(True)
-        self._address_text.setReadOnly(True)
-        self._add_button.setEnabled(True)
-
-        number = len(self.contacts)
-        self._next_button.setEnabled(number > 1)
-        self._previous_button.setEnabled(number > 1)
-
-        self._submit_button.hide()
-        self._cancel_button.hide()
-
-    @Slot()
-    def next(self):
-        name = self._name_line.text()
-        it = iter(self.contacts)
-
-        try:
-            while True:
-                this_name, _ = it.next()
-
-                if this_name == name:
-                    next_name, next_address = it.next()
-                    break
-        except StopIteration:
-            next_name, next_address = iter(self.contacts).next()
-
-        self._name_line.setText(next_name)
-        self._address_text.setText(next_address)
-
-    @Slot()
-    def previous(self):
-        name = self._name_line.text()
-
-        prev_name = prev_address = None
-        for this_name, this_address in self.contacts:
-            if this_name == name:
-                break
-
-            prev_name = this_name
-            prev_address = this_address
-        else:
-            self._name_line.clear()
-            self._address_text.clear()
-            return
-
-        if prev_name is None:
-            for prev_name, prev_address in self.contacts:
-                pass
-
-        self._name_line.setText(prev_name)
-        self._address_text.setText(prev_address)
-
-
-if __name__ == '__main__':
-    app = QApplication(sys.argv)
-
-    address_book = AddressBook()
-    address_book.show()
-
-    sys.exit(app.exec())
diff --git a/examples/widgets/tutorials/addressbook/part4.py b/examples/widgets/tutorials/addressbook/part4.py
deleted file mode 100644
index de4bbfacc..000000000
--- a/examples/widgets/tutorials/addressbook/part4.py
+++ /dev/null
@@ -1,272 +0,0 @@
-# Copyright (C) 2013 Riverbank Computing Limited.
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-from __future__ import annotations
-
-import sys
-
-from PySide6.QtCore import Qt, Slot
-from PySide6.QtWidgets import (QApplication, QGridLayout,
-                               QHBoxLayout, QLabel, QLineEdit,
-                               QMessageBox, QPushButton, QTextEdit,
-                               QVBoxLayout, QWidget)
-
-
-class SortedDict(dict):
-    class Iterator:
-        def __init__(self, sorted_dict):
-            self._dict = sorted_dict
-            self._keys = sorted(self._dict.keys())
-            self._nr_items = len(self._keys)
-            self._idx = 0
-
-        def __iter__(self):
-            return self
-
-        def next(self):
-            if self._idx >= self._nr_items:
-                raise StopIteration
-
-            key = self._keys[self._idx]
-            value = self._dict[key]
-            self._idx += 1
-
-            return key, value
-
-        __next__ = next
-
-    def __iter__(self):
-        return SortedDict.Iterator(self)
-
-    iterkeys = __iter__
-
-
-class AddressBook(QWidget):
-    NavigationMode, AddingMode, EditingMode = range(3)
-
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        self.contacts = SortedDict()
-        self._old_name = ''
-        self._old_address = ''
-        self._current_mode = self.NavigationMode
-
-        name_label = QLabel("Name:")
-        self._name_line = QLineEdit()
-        self._name_line.setReadOnly(True)
-
-        address_label = QLabel("Address:")
-        self._address_text = QTextEdit()
-        self._address_text.setReadOnly(True)
-
-        self._add_button = QPushButton("&Add")
-        self._edit_button = QPushButton("&Edit")
-        self._edit_button.setEnabled(False)
-        self._remove_button = QPushButton("&Remove")
-        self._remove_button.setEnabled(False)
-        self._submit_button = QPushButton("&Submit")
-        self._submit_button.hide()
-        self._cancel_button = QPushButton("&Cancel")
-        self._cancel_button.hide()
-
-        self._next_button = QPushButton("&Next")
-        self._next_button.setEnabled(False)
-        self._previous_button = QPushButton("&Previous")
-        self._previous_button.setEnabled(False)
-
-        self._add_button.clicked.connect(self.add_contact)
-        self._submit_button.clicked.connect(self.submit_contact)
-        self._edit_button.clicked.connect(self.edit_contact)
-        self._remove_button.clicked.connect(self.remove_contact)
-        self._cancel_button.clicked.connect(self.cancel)
-        self._next_button.clicked.connect(self.next)
-        self._previous_button.clicked.connect(self.previous)
-
-        button_layout_1 = QVBoxLayout()
-        button_layout_1.addWidget(self._add_button)
-        button_layout_1.addWidget(self._edit_button)
-        button_layout_1.addWidget(self._remove_button)
-        button_layout_1.addWidget(self._submit_button)
-        button_layout_1.addWidget(self._cancel_button)
-        button_layout_1.addStretch()
-
-        button_layout_2 = QHBoxLayout()
-        button_layout_2.addWidget(self._previous_button)
-        button_layout_2.addWidget(self._next_button)
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(name_label, 0, 0)
-        main_layout.addWidget(self._name_line, 0, 1)
-        main_layout.addWidget(address_label, 1, 0, Qt.AlignmentFlag.AlignTop)
-        main_layout.addWidget(self._address_text, 1, 1)
-        main_layout.addLayout(button_layout_1, 1, 2)
-        main_layout.addLayout(button_layout_2, 3, 1)
-
-        self.setLayout(main_layout)
-        self.setWindowTitle("Simple Address Book")
-
-    @Slot()
-    def add_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self._name_line.clear()
-        self._address_text.clear()
-
-        self.update_interface(self.AddingMode)
-
-    @Slot()
-    def edit_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self.update_interface(self.EditingMode)
-
-    @Slot()
-    def submit_contact(self):
-        name = self._name_line.text()
-        address = self._address_text.toPlainText()
-
-        if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
-            return
-
-        if self._current_mode == self.AddingMode:
-            if name not in self.contacts:
-                self.contacts[name] = address
-                QMessageBox.information(self, "Add Successful",
-                                        f'"{name}" has been added to your address book.')
-            else:
-                QMessageBox.information(self, "Add Unsuccessful",
-                                        f'Sorry, "{name}" is already in your address book.')
-                return
-
-        elif self._current_mode == self.EditingMode:
-            if self._old_name != name:
-                if name not in self.contacts:
-                    QMessageBox.information(self, "Edit Successful",
-                                            f'"{self.oldName}" has been edited in your '
-                                            'address book.')
-                    del self.contacts[self._old_name]
-                    self.contacts[name] = address
-                else:
-                    QMessageBox.information(self, "Edit Unsuccessful",
-                                            f'Sorry, "{name}" is already in your address book.')
-                    return
-            elif self._old_address != address:
-                QMessageBox.information(self, "Edit Successful",
-                                        f'"{name}" has been edited in your address book.')
-                self.contacts[name] = address
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def cancel(self):
-        self._name_line.setText(self._old_name)
-        self._address_text.setText(self._old_address)
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def remove_contact(self):
-        name = self._name_line.text()
-
-        if name in self.contacts:
-            button = QMessageBox.question(self, "Confirm Remove",
-                                          f'Are you sure you want to remove "{name}"?',
-                                          QMessageBox.Yes | QMessageBox.No)
-
-            if button == QMessageBox.Yes:
-                self.previous()
-                del self.contacts[name]
-
-                QMessageBox.information(self, "Remove Successful",
-                                        f'"{name}" has been removed from your address book.')
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def next(self):
-        name = self._name_line.text()
-        it = iter(self.contacts)
-
-        try:
-            while True:
-                this_name, _ = it.next()
-
-                if this_name == name:
-                    next_name, next_address = it.next()
-                    break
-        except StopIteration:
-            next_name, next_address = iter(self.contacts).next()
-
-        self._name_line.setText(next_name)
-        self._address_text.setText(next_address)
-
-    @Slot()
-    def previous(self):
-        name = self._name_line.text()
-
-        prev_name = prev_address = None
-        for this_name, this_address in self.contacts:
-            if this_name == name:
-                break
-
-            prev_name = this_name
-            prev_address = this_address
-        else:
-            self._name_line.clear()
-            self._address_text.clear()
-            return
-
-        if prev_name is None:
-            for prev_name, prev_address in self.contacts:
-                pass
-
-        self._name_line.setText(prev_name)
-        self._address_text.setText(prev_address)
-
-    def update_interface(self, mode):
-        self._current_mode = mode
-
-        if self._current_mode in (self.AddingMode, self.EditingMode):
-            self._name_line.setReadOnly(False)
-            self._name_line.setFocus(Qt.FocusReason.OtherFocusReason)
-            self._address_text.setReadOnly(False)
-
-            self._add_button.setEnabled(False)
-            self._edit_button.setEnabled(False)
-            self._remove_button.setEnabled(False)
-
-            self._next_button.setEnabled(False)
-            self._previous_button.setEnabled(False)
-
-            self._submit_button.show()
-            self._cancel_button.show()
-
-        elif self._current_mode == self.NavigationMode:
-            if not self.contacts:
-                self._name_line.clear()
-                self._address_text.clear()
-
-            self._name_line.setReadOnly(True)
-            self._address_text.setReadOnly(True)
-            self._add_button.setEnabled(True)
-
-            number = len(self.contacts)
-            self._edit_button.setEnabled(number >= 1)
-            self._remove_button.setEnabled(number >= 1)
-            self._next_button.setEnabled(number > 1)
-            self._previous_button.setEnabled(number > 1)
-
-            self._submit_button.hide()
-            self._cancel_button.hide()
-
-
-if __name__ == '__main__':
-    app = QApplication(sys.argv)
-
-    address_book = AddressBook()
-    address_book.show()
-
-    sys.exit(app.exec())
diff --git a/examples/widgets/tutorials/addressbook/part5.py b/examples/widgets/tutorials/addressbook/part5.py
deleted file mode 100644
index 13538207b..000000000
--- a/examples/widgets/tutorials/addressbook/part5.py
+++ /dev/null
@@ -1,331 +0,0 @@
-# Copyright (C) 2013 Riverbank Computing Limited.
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-from __future__ import annotations
-
-import sys
-
-from PySide6.QtCore import Qt, Slot
-from PySide6.QtWidgets import (QApplication, QDialog, QGridLayout,
-                               QHBoxLayout, QLabel, QLineEdit,
-                               QMessageBox, QPushButton, QTextEdit,
-                               QVBoxLayout, QWidget)
-
-
-class SortedDict(dict):
-    class Iterator:
-        def __init__(self, sorted_dict):
-            self._dict = sorted_dict
-            self._keys = sorted(self._dict.keys())
-            self._nr_items = len(self._keys)
-            self._idx = 0
-
-        def __iter__(self):
-            return self
-
-        def next(self):
-            if self._idx >= self._nr_items:
-                raise StopIteration
-
-            key = self._keys[self._idx]
-            value = self._dict[key]
-            self._idx += 1
-
-            return key, value
-
-        __next__ = next
-
-    def __iter__(self):
-        return SortedDict.Iterator(self)
-
-    iterkeys = __iter__
-
-
-class AddressBook(QWidget):
-    NavigationMode, AddingMode, EditingMode = range(3)
-
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        self.contacts = SortedDict()
-        self._old_name = ''
-        self._old_address = ''
-        self._current_mode = self.NavigationMode
-
-        name_label = QLabel("Name:")
-        self._name_line = QLineEdit()
-        self._name_line.setReadOnly(True)
-
-        address_label = QLabel("Address:")
-        self._address_text = QTextEdit()
-        self._address_text.setReadOnly(True)
-
-        self._add_button = QPushButton("&Add")
-        self._edit_button = QPushButton("&Edit")
-        self._edit_button.setEnabled(False)
-        self._remove_button = QPushButton("&Remove")
-        self._remove_button.setEnabled(False)
-        self._find_button = QPushButton("&Find")
-        self._find_button.setEnabled(False)
-        self._submit_button = QPushButton("&Submit")
-        self._submit_button.hide()
-        self._cancel_button = QPushButton("&Cancel")
-        self._cancel_button.hide()
-
-        self._next_button = QPushButton("&Next")
-        self._next_button.setEnabled(False)
-        self._previous_button = QPushButton("&Previous")
-        self._previous_button.setEnabled(False)
-
-        self.dialog = FindDialog()
-
-        self._add_button.clicked.connect(self.add_contact)
-        self._submit_button.clicked.connect(self.submit_contact)
-        self._edit_button.clicked.connect(self.edit_contact)
-        self._remove_button.clicked.connect(self.remove_contact)
-        self._find_button.clicked.connect(self.find_contact)
-        self._cancel_button.clicked.connect(self.cancel)
-        self._next_button.clicked.connect(self.next)
-        self._previous_button.clicked.connect(self.previous)
-
-        button_layout_1 = QVBoxLayout()
-        button_layout_1.addWidget(self._add_button)
-        button_layout_1.addWidget(self._edit_button)
-        button_layout_1.addWidget(self._remove_button)
-        button_layout_1.addWidget(self._find_button)
-        button_layout_1.addWidget(self._submit_button)
-        button_layout_1.addWidget(self._cancel_button)
-        button_layout_1.addStretch()
-
-        button_layout_2 = QHBoxLayout()
-        button_layout_2.addWidget(self._previous_button)
-        button_layout_2.addWidget(self._next_button)
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(name_label, 0, 0)
-        main_layout.addWidget(self._name_line, 0, 1)
-        main_layout.addWidget(address_label, 1, 0, Qt.AlignmentFlag.AlignTop)
-        main_layout.addWidget(self._address_text, 1, 1)
-        main_layout.addLayout(button_layout_1, 1, 2)
-        main_layout.addLayout(button_layout_2, 2, 1)
-
-        self.setLayout(main_layout)
-        self.setWindowTitle("Simple Address Book")
-
-    @Slot()
-    def add_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self._name_line.clear()
-        self._address_text.clear()
-
-        self.update_interface(self.AddingMode)
-
-    @Slot()
-    def edit_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self.update_interface(self.EditingMode)
-
-    @Slot()
-    def submit_contact(self):
-        name = self._name_line.text()
-        address = self._address_text.toPlainText()
-
-        if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
-            return
-
-        if self._current_mode == self.AddingMode:
-            if name not in self.contacts:
-                self.contacts[name] = address
-                QMessageBox.information(self, "Add Successful",
-                                        f'"{name}" has been added to your address book.')
-            else:
-                QMessageBox.information(self, "Add Unsuccessful",
-                                        f'Sorry, "{name}" is already in your address book.')
-                return
-
-        elif self._current_mode == self.EditingMode:
-            if self._old_name != name:
-                if name not in self.contacts:
-                    QMessageBox.information(self, "Edit Successful",
-                                            f'"{self.oldName}" has been edited in your '
-                                            'address book.')
-                    del self.contacts[self._old_name]
-                    self.contacts[name] = address
-                else:
-                    QMessageBox.information(self, "Edit Unsuccessful",
-                                            f'Sorry, "{name}" is already in your address book.')
-                    return
-            elif self._old_address != address:
-                QMessageBox.information(self, "Edit Successful",
-                                        f'"{name}" has been edited in your address book.')
-                self.contacts[name] = address
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def cancel(self):
-        self._name_line.setText(self._old_name)
-        self._address_text.setText(self._old_address)
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def remove_contact(self):
-        name = self._name_line.text()
-
-        if name in self.contacts:
-            button = QMessageBox.question(self, "Confirm Remove",
-                                          f'Are you sure you want to remove "{name}"?',
-                                          QMessageBox.Yes | QMessageBox.No)
-
-            if button == QMessageBox.Yes:
-                self.previous()
-                del self.contacts[name]
-
-                QMessageBox.information(self, "Remove Successful",
-                                        f'"{name}" has been removed from your address book.')
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def next(self):
-        name = self._name_line.text()
-        it = iter(self.contacts)
-
-        try:
-            while True:
-                this_name, _ = it.next()
-
-                if this_name == name:
-                    next_name, next_address = it.next()
-                    break
-        except StopIteration:
-            next_name, next_address = iter(self.contacts).next()
-
-        self._name_line.setText(next_name)
-        self._address_text.setText(next_address)
-
-    @Slot()
-    def previous(self):
-        name = self._name_line.text()
-
-        prev_name = prev_address = None
-        for this_name, this_address in self.contacts:
-            if this_name == name:
-                break
-
-            prev_name = this_name
-            prev_address = this_address
-        else:
-            self._name_line.clear()
-            self._address_text.clear()
-            return
-
-        if prev_name is None:
-            for prev_name, prev_address in self.contacts:
-                pass
-
-        self._name_line.setText(prev_name)
-        self._address_text.setText(prev_address)
-
-    def find_contact(self):
-        self.dialog.show()
-
-        if self.dialog.exec() == QDialog.Accepted:
-            contact_name = self.dialog.get_find_text()
-
-            if contact_name in self.contacts:
-                self._name_line.setText(contact_name)
-                self._address_text.setText(self.contacts[contact_name])
-            else:
-                QMessageBox.information(self, "Contact Not Found",
-                                        f'Sorry, "{contact_name}" is not in your address book.')
-                return
-
-        self.update_interface(self.NavigationMode)
-
-    def update_interface(self, mode):
-        self._current_mode = mode
-
-        if self._current_mode in (self.AddingMode, self.EditingMode):
-            self._name_line.setReadOnly(False)
-            self._name_line.setFocus(Qt.FocusReason.OtherFocusReason)
-            self._address_text.setReadOnly(False)
-
-            self._add_button.setEnabled(False)
-            self._edit_button.setEnabled(False)
-            self._remove_button.setEnabled(False)
-
-            self._next_button.setEnabled(False)
-            self._previous_button.setEnabled(False)
-
-            self._submit_button.show()
-            self._cancel_button.show()
-
-        elif self._current_mode == self.NavigationMode:
-            if not self.contacts:
-                self._name_line.clear()
-                self._address_text.clear()
-
-            self._name_line.setReadOnly(True)
-            self._address_text.setReadOnly(True)
-            self._add_button.setEnabled(True)
-
-            number = len(self.contacts)
-            self._edit_button.setEnabled(number >= 1)
-            self._remove_button.setEnabled(number >= 1)
-            self._find_button.setEnabled(number > 2)
-            self._next_button.setEnabled(number > 1)
-            self._previous_button.setEnabled(number > 1)
-
-            self._submit_button.hide()
-            self._cancel_button.hide()
-
-
-class FindDialog(QDialog):
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        find_label = QLabel("Enter the name of a contact:")
-        self._line_edit = QLineEdit()
-
-        self._find_button = QPushButton("&Find")
-        self._find_text = ''
-
-        layout = QHBoxLayout()
-        layout.addWidget(find_label)
-        layout.addWidget(self._line_edit)
-        layout.addWidget(self._find_button)
-
-        self.setLayout(layout)
-        self.setWindowTitle("Find a Contact")
-
-        self._find_button.clicked.connect(self.find_clicked)
-        self._find_button.clicked.connect(self.accept)
-
-    def find_clicked(self):
-        text = self._line_edit.text()
-
-        if not text:
-            QMessageBox.information(self, "Empty Field", "Please enter a name.")
-            return
-        else:
-            self._find_text = text
-            self._line_edit.clear()
-            self.hide()
-
-    def get_find_text(self):
-        return self._find_text
-
-
-if __name__ == '__main__':
-    app = QApplication(sys.argv)
-
-    address_book = AddressBook()
-    address_book.show()
-
-    sys.exit(app.exec())
diff --git a/examples/widgets/tutorials/addressbook/part6.py b/examples/widgets/tutorials/addressbook/part6.py
deleted file mode 100644
index 73dcd067d..000000000
--- a/examples/widgets/tutorials/addressbook/part6.py
+++ /dev/null
@@ -1,394 +0,0 @@
-# Copyright (C) 2013 Riverbank Computing Limited.
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-from __future__ import annotations
-
-import pickle
-import sys
-
-from PySide6.QtCore import Qt, Slot
-from PySide6.QtWidgets import (QApplication, QDialog, QFileDialog,
-                               QGridLayout, QHBoxLayout, QLabel, QLineEdit,
-                               QMessageBox, QPushButton, QTextEdit,
-                               QVBoxLayout, QWidget)
-
-
-class SortedDict(dict):
-    class Iterator:
-        def __init__(self, sorted_dict):
-            self._dict = sorted_dict
-            self._keys = sorted(self._dict.keys())
-            self._nr_items = len(self._keys)
-            self._idx = 0
-
-        def __iter__(self):
-            return self
-
-        def next(self):
-            if self._idx >= self._nr_items:
-                raise StopIteration
-
-            key = self._keys[self._idx]
-            value = self._dict[key]
-            self._idx += 1
-
-            return key, value
-
-        __next__ = next
-
-    def __iter__(self):
-        return SortedDict.Iterator(self)
-
-    iterkeys = __iter__
-
-
-class AddressBook(QWidget):
-    NavigationMode, AddingMode, EditingMode = range(3)
-
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        self.contacts = SortedDict()
-        self._old_name = ''
-        self._old_address = ''
-        self._current_mode = self.NavigationMode
-
-        name_label = QLabel("Name:")
-        self._name_line = QLineEdit()
-        self._name_line.setReadOnly(True)
-
-        address_label = QLabel("Address:")
-        self._address_text = QTextEdit()
-        self._address_text.setReadOnly(True)
-
-        self._add_button = QPushButton("&Add")
-        self._edit_button = QPushButton("&Edit")
-        self._edit_button.setEnabled(False)
-        self._remove_button = QPushButton("&Remove")
-        self._remove_button.setEnabled(False)
-        self._find_button = QPushButton("&Find")
-        self._find_button.setEnabled(False)
-        self._submit_button = QPushButton("&Submit")
-        self._submit_button.hide()
-        self._cancel_button = QPushButton("&Cancel")
-        self._cancel_button.hide()
-
-        self._next_button = QPushButton("&Next")
-        self._next_button.setEnabled(False)
-        self._previous_button = QPushButton("&Previous")
-        self._previous_button.setEnabled(False)
-
-        self._load_button = QPushButton("&Load...")
-        self._load_button.setToolTip("Load contacts from a file")
-        self._save_button = QPushButton("Sa&ve...")
-        self._save_button.setToolTip("Save contacts to a file")
-        self._save_button.setEnabled(False)
-
-        self.dialog = FindDialog()
-
-        self._add_button.clicked.connect(self.add_contact)
-        self._submit_button.clicked.connect(self.submit_contact)
-        self._edit_button.clicked.connect(self.edit_contact)
-        self._remove_button.clicked.connect(self.remove_contact)
-        self._find_button.clicked.connect(self.find_contact)
-        self._cancel_button.clicked.connect(self.cancel)
-        self._next_button.clicked.connect(self.next)
-        self._previous_button.clicked.connect(self.previous)
-        self._load_button.clicked.connect(self.load_from_file)
-        self._save_button.clicked.connect(self.save_to_file)
-
-        button_layout_1 = QVBoxLayout()
-        button_layout_1.addWidget(self._add_button)
-        button_layout_1.addWidget(self._edit_button)
-        button_layout_1.addWidget(self._remove_button)
-        button_layout_1.addWidget(self._find_button)
-        button_layout_1.addWidget(self._submit_button)
-        button_layout_1.addWidget(self._cancel_button)
-        button_layout_1.addWidget(self._load_button)
-        button_layout_1.addWidget(self._save_button)
-        button_layout_1.addStretch()
-
-        button_layout_2 = QHBoxLayout()
-        button_layout_2.addWidget(self._previous_button)
-        button_layout_2.addWidget(self._next_button)
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(name_label, 0, 0)
-        main_layout.addWidget(self._name_line, 0, 1)
-        main_layout.addWidget(address_label, 1, 0, Qt.AlignmentFlag.AlignTop)
-        main_layout.addWidget(self._address_text, 1, 1)
-        main_layout.addLayout(button_layout_1, 1, 2)
-        main_layout.addLayout(button_layout_2, 2, 1)
-
-        self.setLayout(main_layout)
-        self.setWindowTitle("Simple Address Book")
-
-    @Slot()
-    def add_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self._name_line.clear()
-        self._address_text.clear()
-
-        self.update_interface(self.AddingMode)
-
-    @Slot()
-    def edit_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self.update_interface(self.EditingMode)
-
-    @Slot()
-    def submit_contact(self):
-        name = self._name_line.text()
-        address = self._address_text.toPlainText()
-
-        if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
-            return
-
-        if self._current_mode == self.AddingMode:
-            if name not in self.contacts:
-                self.contacts[name] = address
-                QMessageBox.information(self, "Add Successful",
-                                        f'"{name}" has been added to your address book.')
-            else:
-                QMessageBox.information(self, "Add Unsuccessful",
-                                        f'Sorry, "{name}" is already in your address book.')
-                return
-
-        elif self._current_mode == self.EditingMode:
-            if self._old_name != name:
-                if name not in self.contacts:
-                    QMessageBox.information(self, "Edit Successful",
-                                            f'"{self.oldName}" has been edited in your '
-                                            'address book.')
-                    del self.contacts[self._old_name]
-                    self.contacts[name] = address
-                else:
-                    QMessageBox.information(self, "Edit Unsuccessful",
-                                            f'Sorry, "{name}" is already in your address book.')
-                    return
-            elif self._old_address != address:
-                QMessageBox.information(self, "Edit Successful",
-                                        f'"{name}" has been edited in your address book.')
-                self.contacts[name] = address
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def cancel(self):
-        self._name_line.setText(self._old_name)
-        self._address_text.setText(self._old_address)
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def remove_contact(self):
-        name = self._name_line.text()
-
-        if name in self.contacts:
-            button = QMessageBox.question(self, "Confirm Remove",
-                                          f'Are you sure you want to remove "{name}"?',
-                                          QMessageBox.Yes | QMessageBox.No)
-
-            if button == QMessageBox.Yes:
-                self.previous()
-                del self.contacts[name]
-
-                QMessageBox.information(self, "Remove Successful",
-                                        f'"{name}" has been removed from your address book.')
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def next(self):
-        name = self._name_line.text()
-        it = iter(self.contacts)
-
-        try:
-            while True:
-                this_name, _ = it.next()
-
-                if this_name == name:
-                    next_name, next_address = it.next()
-                    break
-        except StopIteration:
-            next_name, next_address = iter(self.contacts).next()
-
-        self._name_line.setText(next_name)
-        self._address_text.setText(next_address)
-
-    @Slot()
-    def previous(self):
-        name = self._name_line.text()
-
-        prev_name = prev_address = None
-        for this_name, this_address in self.contacts:
-            if this_name == name:
-                break
-
-            prev_name = this_name
-            prev_address = this_address
-        else:
-            self._name_line.clear()
-            self._address_text.clear()
-            return
-
-        if prev_name is None:
-            for prev_name, prev_address in self.contacts:
-                pass
-
-        self._name_line.setText(prev_name)
-        self._address_text.setText(prev_address)
-
-    def find_contact(self):
-        self.dialog.show()
-
-        if self.dialog.exec() == QDialog.Accepted:
-            contact_name = self.dialog.get_find_text()
-
-            if contact_name in self.contacts:
-                self._name_line.setText(contact_name)
-                self._address_text.setText(self.contacts[contact_name])
-            else:
-                QMessageBox.information(self, "Contact Not Found",
-                                        f'Sorry, "{contact_name}" is not in your address book.')
-                return
-
-        self.update_interface(self.NavigationMode)
-
-    def update_interface(self, mode):
-        self._current_mode = mode
-
-        if self._current_mode in (self.AddingMode, self.EditingMode):
-            self._name_line.setReadOnly(False)
-            self._name_line.setFocus(Qt.FocusReason.OtherFocusReason)
-            self._address_text.setReadOnly(False)
-
-            self._add_button.setEnabled(False)
-            self._edit_button.setEnabled(False)
-            self._remove_button.setEnabled(False)
-
-            self._next_button.setEnabled(False)
-            self._previous_button.setEnabled(False)
-
-            self._submit_button.show()
-            self._cancel_button.show()
-
-            self._load_button.setEnabled(False)
-            self._save_button.setEnabled(False)
-
-        elif self._current_mode == self.NavigationMode:
-            if not self.contacts:
-                self._name_line.clear()
-                self._address_text.clear()
-
-            self._name_line.setReadOnly(True)
-            self._address_text.setReadOnly(True)
-            self._add_button.setEnabled(True)
-
-            number = len(self.contacts)
-            self._edit_button.setEnabled(number >= 1)
-            self._remove_button.setEnabled(number >= 1)
-            self._find_button.setEnabled(number > 2)
-            self._next_button.setEnabled(number > 1)
-            self._previous_button.setEnabled(number > 1)
-
-            self._submit_button.hide()
-            self._cancel_button.hide()
-
-            self._load_button.setEnabled(True)
-            self._save_button.setEnabled(number >= 1)
-
-    def save_to_file(self):
-        fileName, _ = QFileDialog.getSaveFileName(self,
-                                                  "Save Address Book", '',
-                                                  "Address Book (*.abk);;All Files (*)")
-
-        if not fileName:
-            return
-
-        try:
-            out_file = open(str(fileName), 'wb')
-        except IOError:
-            QMessageBox.information(self, "Unable to open file",
-                                    f'There was an error opening "{fileName}"')
-            return
-
-        pickle.dump(self.contacts, out_file)
-        out_file.close()
-
-    def load_from_file(self):
-        fileName, _ = QFileDialog.getOpenFileName(self,
-                                                  "Open Address Book", '',
-                                                  "Address Book (*.abk);;All Files (*)")
-
-        if not fileName:
-            return
-
-        try:
-            in_file = open(str(fileName), 'rb')
-        except IOError:
-            QMessageBox.information(self, "Unable to open file",
-                                    f'There was an error opening "{fileName}"')
-            return
-
-        self.contacts = pickle.load(in_file)
-        in_file.close()
-
-        if len(self.contacts) == 0:
-            QMessageBox.information(self, "No contacts in file",
-                                    "The file you are attempting to open contains no contacts.")
-        else:
-            for name, address in self.contacts:
-                self._name_line.setText(name)
-                self._address_text.setText(address)
-
-        self.update_interface(self.NavigationMode)
-
-
-class FindDialog(QDialog):
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        find_label = QLabel("Enter the name of a contact:")
-        self._line_edit = QLineEdit()
-
-        self._find_button = QPushButton("&Find")
-        self._find_text = ''
-
-        layout = QHBoxLayout()
-        layout.addWidget(find_label)
-        layout.addWidget(self._line_edit)
-        layout.addWidget(self._find_button)
-
-        self.setLayout(layout)
-        self.setWindowTitle("Find a Contact")
-
-        self._find_button.clicked.connect(self.find_clicked)
-        self._find_button.clicked.connect(self.accept)
-
-    def find_clicked(self):
-        text = self._line_edit.text()
-
-        if not text:
-            QMessageBox.information(self, "Empty Field", "Please enter a name.")
-            return
-
-        self._find_text = text
-        self._line_edit.clear()
-        self.hide()
-
-    def get_find_text(self):
-        return self._find_text
-
-
-if __name__ == '__main__':
-    app = QApplication(sys.argv)
-
-    address_book = AddressBook()
-    address_book.show()
-
-    sys.exit(app.exec())
diff --git a/examples/widgets/tutorials/addressbook/part7.py b/examples/widgets/tutorials/addressbook/part7.py
deleted file mode 100644
index 12e205577..000000000
--- a/examples/widgets/tutorials/addressbook/part7.py
+++ /dev/null
@@ -1,445 +0,0 @@
-# Copyright (C) 2013 Riverbank Computing Limited.
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-from __future__ import annotations
-
-import pickle
-import sys
-
-from PySide6.QtCore import QFile, QIODevice, QTextStream, Qt, Slot
-from PySide6.QtWidgets import (QApplication, QDialog, QFileDialog,
-                               QGridLayout, QHBoxLayout, QLabel, QLineEdit,
-                               QMessageBox, QPushButton, QTextEdit,
-                               QVBoxLayout, QWidget)
-
-
-class SortedDict(dict):
-    class Iterator:
-        def __init__(self, sorted_dict):
-            self._dict = sorted_dict
-            self._keys = sorted(self._dict.keys())
-            self._nr_items = len(self._keys)
-            self._idx = 0
-
-        def __iter__(self):
-            return self
-
-        def next(self):
-            if self._idx >= self._nr_items:
-                raise StopIteration
-
-            key = self._keys[self._idx]
-            value = self._dict[key]
-            self._idx += 1
-
-            return key, value
-
-        __next__ = next
-
-    def __iter__(self):
-        return SortedDict.Iterator(self)
-
-    iterkeys = __iter__
-
-
-class AddressBook(QWidget):
-    NavigationMode, AddingMode, EditingMode = range(3)
-
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        self.contacts = SortedDict()
-        self._old_name = ''
-        self._old_address = ''
-        self._current_mode = self.NavigationMode
-
-        name_label = QLabel("Name:")
-        self._name_line = QLineEdit()
-        self._name_line.setReadOnly(True)
-
-        address_label = QLabel("Address:")
-        self._address_text = QTextEdit()
-        self._address_text.setReadOnly(True)
-
-        self._add_button = QPushButton("&Add")
-        self._edit_button = QPushButton("&Edit")
-        self._edit_button.setEnabled(False)
-        self._remove_button = QPushButton("&Remove")
-        self._remove_button.setEnabled(False)
-        self._find_button = QPushButton("&Find")
-        self._find_button.setEnabled(False)
-        self._submit_button = QPushButton("&Submit")
-        self._submit_button.hide()
-        self._cancel_button = QPushButton("&Cancel")
-        self._cancel_button.hide()
-
-        self._next_button = QPushButton("&Next")
-        self._next_button.setEnabled(False)
-        self._previous_button = QPushButton("&Previous")
-        self._previous_button.setEnabled(False)
-
-        self._load_button = QPushButton("&Load...")
-        self._load_button.setToolTip("Load contacts from a file")
-        self._save_button = QPushButton("Sa&ve...")
-        self._save_button.setToolTip("Save contacts to a file")
-        self._save_button.setEnabled(False)
-
-        self._export_button = QPushButton("Ex&port")
-        self._export_button.setToolTip("Export as vCard")
-        self._export_button.setEnabled(False)
-
-        self.dialog = FindDialog()
-
-        self._add_button.clicked.connect(self.add_contact)
-        self._submit_button.clicked.connect(self.submit_contact)
-        self._edit_button.clicked.connect(self.edit_contact)
-        self._remove_button.clicked.connect(self.remove_contact)
-        self._find_button.clicked.connect(self.find_contact)
-        self._cancel_button.clicked.connect(self.cancel)
-        self._next_button.clicked.connect(self.next)
-        self._previous_button.clicked.connect(self.previous)
-        self._load_button.clicked.connect(self.load_from_file)
-        self._save_button.clicked.connect(self.save_to_file)
-        self._export_button.clicked.connect(self.export_as_vcard)
-
-        button_layout_1 = QVBoxLayout()
-        button_layout_1.addWidget(self._add_button)
-        button_layout_1.addWidget(self._edit_button)
-        button_layout_1.addWidget(self._remove_button)
-        button_layout_1.addWidget(self._find_button)
-        button_layout_1.addWidget(self._submit_button)
-        button_layout_1.addWidget(self._cancel_button)
-        button_layout_1.addWidget(self._load_button)
-        button_layout_1.addWidget(self._save_button)
-        button_layout_1.addWidget(self._export_button)
-        button_layout_1.addStretch()
-
-        button_layout_2 = QHBoxLayout()
-        button_layout_2.addWidget(self._previous_button)
-        button_layout_2.addWidget(self._next_button)
-
-        main_layout = QGridLayout()
-        main_layout.addWidget(name_label, 0, 0)
-        main_layout.addWidget(self._name_line, 0, 1)
-        main_layout.addWidget(address_label, 1, 0, Qt.AlignmentFlag.AlignTop)
-        main_layout.addWidget(self._address_text, 1, 1)
-        main_layout.addLayout(button_layout_1, 1, 2)
-        main_layout.addLayout(button_layout_2, 2, 1)
-
-        self.setLayout(main_layout)
-        self.setWindowTitle("Simple Address Book")
-
-    @Slot()
-    def add_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self._name_line.clear()
-        self._address_text.clear()
-
-        self.update_interface(self.AddingMode)
-
-    @Slot()
-    def edit_contact(self):
-        self._old_name = self._name_line.text()
-        self._old_address = self._address_text.toPlainText()
-
-        self.update_interface(self.EditingMode)
-
-    @Slot()
-    def submit_contact(self):
-        name = self._name_line.text()
-        address = self._address_text.toPlainText()
-
-        if name == "" or address == "":
-            QMessageBox.information(self, "Empty Field", "Please enter a name and address.")
-            return
-
-        if self._current_mode == self.AddingMode:
-            if name not in self.contacts:
-                self.contacts[name] = address
-                QMessageBox.information(self, "Add Successful",
-                                        f'"{name}" has been added to your address book.')
-            else:
-                QMessageBox.information(self, "Add Unsuccessful",
-                                        f'Sorry, "{name}" is already in your address book.')
-                return
-
-        elif self._current_mode == self.EditingMode:
-            if self._old_name != name:
-                if name not in self.contacts:
-                    QMessageBox.information(self, "Edit Successful",
-                                            f'"{self.oldName}" has been edited in your '
-                                            'address book.')
-                    del self.contacts[self._old_name]
-                    self.contacts[name] = address
-                else:
-                    QMessageBox.information(self, "Edit Unsuccessful",
-                                            f'Sorry, "{name}" is already in your address book.')
-                    return
-            elif self._old_address != address:
-                QMessageBox.information(self, "Edit Successful",
-                                        f'"{name}" has been edited in your address book.')
-                self.contacts[name] = address
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def cancel(self):
-        self._name_line.setText(self._old_name)
-        self._address_text.setText(self._old_address)
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def remove_contact(self):
-        name = self._name_line.text()
-
-        if name in self.contacts:
-            button = QMessageBox.question(self, "Confirm Remove",
-                                          f'Are you sure you want to remove "{name}"?',
-                                          QMessageBox.Yes | QMessageBox.No)
-
-            if button == QMessageBox.Yes:
-                self.previous()
-                del self.contacts[name]
-
-                QMessageBox.information(self, "Remove Successful",
-                                        f'"{name}" has been removed from your address book.')
-
-        self.update_interface(self.NavigationMode)
-
-    @Slot()
-    def next(self):
-        name = self._name_line.text()
-        it = iter(self.contacts)
-
-        try:
-            while True:
-                this_name, _ = it.next()
-
-                if this_name == name:
-                    next_name, next_address = it.next()
-                    break
-        except StopIteration:
-            next_name, next_address = iter(self.contacts).next()
-
-        self._name_line.setText(next_name)
-        self._address_text.setText(next_address)
-
-    @Slot()
-    def previous(self):
-        name = self._name_line.text()
-
-        prev_name = prev_address = None
-        for this_name, this_address in self.contacts:
-            if this_name == name:
-                break
-
-            prev_name = this_name
-            prev_address = this_address
-        else:
-            self._name_line.clear()
-            self._address_text.clear()
-            return
-
-        if prev_name is None:
-            for prev_name, prev_address in self.contacts:
-                pass
-
-        self._name_line.setText(prev_name)
-        self._address_text.setText(prev_address)
-
-    def find_contact(self):
-        self.dialog.show()
-
-        if self.dialog.exec() == QDialog.Accepted:
-            contact_name = self.dialog.get_find_text()
-
-            if contact_name in self.contacts:
-                self._name_line.setText(contact_name)
-                self._address_text.setText(self.contacts[contact_name])
-            else:
-                QMessageBox.information(self, "Contact Not Found",
-                                        f'Sorry, "{contact_name}" is not in your address book.')
-                return
-
-        self.update_interface(self.NavigationMode)
-
-    def update_interface(self, mode):
-        self._current_mode = mode
-
-        if self._current_mode in (self.AddingMode, self.EditingMode):
-            self._name_line.setReadOnly(False)
-            self._name_line.setFocus(Qt.FocusReason.OtherFocusReason)
-            self._address_text.setReadOnly(False)
-
-            self._add_button.setEnabled(False)
-            self._edit_button.setEnabled(False)
-            self._remove_button.setEnabled(False)
-
-            self._next_button.setEnabled(False)
-            self._previous_button.setEnabled(False)
-
-            self._submit_button.show()
-            self._cancel_button.show()
-
-            self._load_button.setEnabled(False)
-            self._save_button.setEnabled(False)
-            self._export_button.setEnabled(False)
-
-        elif self._current_mode == self.NavigationMode:
-            if not self.contacts:
-                self._name_line.clear()
-                self._address_text.clear()
-
-            self._name_line.setReadOnly(True)
-            self._address_text.setReadOnly(True)
-            self._add_button.setEnabled(True)
-
-            number = len(self.contacts)
-            self._edit_button.setEnabled(number >= 1)
-            self._remove_button.setEnabled(number >= 1)
-            self._find_button.setEnabled(number > 2)
-            self._next_button.setEnabled(number > 1)
-            self._previous_button.setEnabled(number > 1)
-
-            self._submit_button.hide()
-            self._cancel_button.hide()
-
-            self._export_button.setEnabled(number >= 1)
-
-            self._load_button.setEnabled(True)
-            self._save_button.setEnabled(number >= 1)
-
-    def save_to_file(self):
-        fileName, _ = QFileDialog.getSaveFileName(self,
-                                                  "Save Address Book", '',
-                                                  "Address Book (*.abk);;All Files (*)")
-
-        if not fileName:
-            return
-
-        try:
-            out_file = open(str(fileName), 'wb')
-        except IOError:
-            QMessageBox.information(self, "Unable to open file",
-                                    f'There was an error opening "{fileName}"')
-            return
-
-        pickle.dump(self.contacts, out_file)
-        out_file.close()
-
-    def load_from_file(self):
-        fileName, _ = QFileDialog.getOpenFileName(self,
-                                                  "Open Address Book", '',
-                                                  "Address Book (*.abk);;All Files (*)")
-
-        if not fileName:
-            return
-
-        try:
-            in_file = open(str(fileName), 'rb')
-        except IOError:
-            QMessageBox.information(self, "Unable to open file",
-                                    f'There was an error opening "{fileName}"')
-            return
-
-        self.contacts = pickle.load(in_file)
-        in_file.close()
-
-        if len(self.contacts) == 0:
-            QMessageBox.information(self, "No contacts in file",
-                                    "The file you are attempting to open contains no contacts.")
-        else:
-            for name, address in self.contacts:
-                self._name_line.setText(name)
-                self._address_text.setText(address)
-
-        self.update_interface(self.NavigationMode)
-
-    def export_as_vcard(self):
-        name = str(self._name_line.text())
-        address = self._address_text.toPlainText()
-
-        name_list = name.split()
-
-        if len(name_list) > 1:
-            first_name = name_list[0]
-            last_name = name_list[-1]
-        else:
-            first_name = name
-            last_name = ''
-
-        file_name = QFileDialog.getSaveFileName(self, "Export Contact",
-                                                '', "vCard Files (*.vcf);;All Files (*)")[0]
-
-        if not file_name:
-            return
-
-        out_file = QFile(file_name)
-
-        if not out_file.open(QIODevice.OpenModeFlag.WriteOnly):
-            QMessageBox.information(self, "Unable to open file", out_file.errorString())
-            return
-
-        out_s = QTextStream(out_file)
-
-        out_s << 'BEGIN:VCARD' << '\n'
-        out_s << 'VERSION:2.1' << '\n'
-        out_s << 'N:' << last_name << ';' << first_name << '\n'
-        out_s << 'FN:' << ' '.join(name_list) << '\n'
-
-        address.replace(';', '\\;')
-        address.replace('\n', ';')
-        address.replace(',', ' ')
-
-        out_s << 'ADR;HOME:;' << address << '\n'
-        out_s << 'END:VCARD' << '\n'
-
-        QMessageBox.information(self, "Export Successful",
-                                f'"{name}" has been exported as a vCard.')
-
-
-class FindDialog(QDialog):
-    def __init__(self, parent=None):
-        super().__init__(parent)
-
-        find_label = QLabel("Enter the name of a contact:")
-        self._line_edit = QLineEdit()
-
-        self._find_button = QPushButton("&Find")
-        self._find_text = ''
-
-        layout = QHBoxLayout()
-        layout.addWidget(find_label)
-        layout.addWidget(self._line_edit)
-        layout.addWidget(self._find_button)
-
-        self.setLayout(layout)
-        self.setWindowTitle("Find a Contact")
-
-        self._find_button.clicked.connect(self.find_clicked)
-        self._find_button.clicked.connect(self.accept)
-
-    def find_clicked(self):
-        text = self._line_edit.text()
-
-        if not text:
-            QMessageBox.information(self, "Empty Field", "Please enter a name.")
-            return
-
-        self._find_text = text
-        self._line_edit.clear()
-        self.hide()
-
-    def get_find_text(self):
-        return self._find_text
-
-
-if __name__ == '__main__':
-    app = QApplication(sys.argv)
-
-    address_book = AddressBook()
-    address_book.show()
-
-    sys.exit(app.exec())