Python File Handling | File Operations in Python | Learn python programming | Edureka
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The document outlines a Python certification training agenda focused on file handling, covering the need for file handling, file types, and practical approaches for CRUD operations. Key functions like open(), read(), and write() are explained, alongside examples and methods for creating, reading, and deleting files. The content also emphasizes the importance of file modes and handling errors when working with files in Python.
Python File Handling | File Operations in Python | Learn python programming | Edureka
- 1. Python Certification Training https://www.edureka.co/python Agenda File Handling In Python
- 2. Python Certification Training https://www.edureka.co/python Agenda File Handling In Python
- 3. Python Certification Training https://www.edureka.co/python Agenda Introduction 01 Why need File Handling? Getting Started 02 Concepts 03 Practical Approach 04 Types of Files Looking at code to understand theory Python File Handling System
- 4. Python Certification Training https://www.edureka.co/python Why need File Handling? File Handling In Python
- 5. Python Certification Training https://www.edureka.co/python Why Need File Handling? Python Input Arguments Standard Input Files
- 6. Python Certification Training https://www.edureka.co/python Types of Files File Handling In Python
- 7. Python Certification Training https://www.edureka.co/python Types Of Files What you may know as a file is slightly different in Python Text BinaryImage Text AudioExecutable
- 8. Python Certification Training https://www.edureka.co/python What is File Handling? File Handling In Python
- 9. Python Certification Training https://www.edureka.co/python What Is File Handling? File handling is an important part of any web application Operations Creating DeletionReading Updating CRUD
- 10. Python Certification Training https://www.edureka.co/python Python File Handling System File Handling In Python
- 11. Python Certification Training https://www.edureka.co/python Python File Handling System The key function for working with files in Python is the open() function open() Filename Mode Syntax open( filename, mode) WORK Create File Open File WORK Close File
- 12. Python Certification Training https://www.edureka.co/python Python File Handling System The key function for working with files in Python is the open() function Syntax open( filename, mode) Any name that you want Different modes for opening a file "r" - Read - Default value. Opens a file for reading, error if the file does not exist "a" - Append - Opens a file for appending, creates the file if it does not exist "w" - Write - Opens a file for writing, creates the file if it does not exist "x" - Create - Creates the specified file, returns an error if the file exists "t" - Text - Default value. Text mode "b" - Binary - Binary mode (e.g. images) In addition you can specify if the file should be handled as binary or text mode
- 13. Python Certification Training https://www.edureka.co/python Python File Handling System Example Code Example f = open(“demofile.txt”) Example f = open(“demofile.txt”, “r”) Note: Make sure file exists or else error!
- 14. Python Certification Training https://www.edureka.co/python File Operations for Reading File Handling In Python
- 15. Python Certification Training https://www.edureka.co/python Reading Text File In Python file.read() Example > file = open(“testfile.text”, “r”) > print file.read() Lots of ways to read a text file in Python All characters Some characters
- 16. Python Certification Training https://www.edureka.co/python Reading Text File In Python file.read() Example > file = open(“testfile.text”, “r”) > print file.read() Example > file = open(“testfile.text”, “r”) > print file.read(5) This 5 indicates what?
- 17. Python Certification Training https://www.edureka.co/python Reading Text File In Python file.read() Example > file = open(“testfile.text”, “r”) > print file.readline(): Line by line output Example > file = open(“testfile.text”, “r”) > print file.readline(3): Read third line only Example > file = open(“testfile.text”, “r”) > print file.readlines(): Read lines separately
- 18. Python Certification Training https://www.edureka.co/python Looping Over A File Object Fast and efficient! Example > file = open(“testfile.text”, “r”) > for line in file: > print file.readline(): Looping over the object Reading from files
- 19. Python Certification Training https://www.edureka.co/python Python File Write Method File Handling In Python
- 20. Python Certification Training https://www.edureka.co/python File Write Method Writing to an existing file To write to an existing file, you must add a parameter to the open() function: "a" - Append - will append to the end of the file "w" - Write - will overwrite any existing content Example > f = open("demofile.txt", "a") > f.write(“ We love Edureka!") Example > f = open("demofile.txt", “w") > f.write(“ We love Edureka!") Note: the "w" method will overwrite the entire file.
- 21. Python Certification Training https://www.edureka.co/python File Write Method Example > file = open(“testfile.txt”, “w”) > file.write(“This is a test”) > file.write(“To add more lines.”) > file.close() I’m writing files!
- 22. Python Certification Training https://www.edureka.co/python Creating a New File File Handling In Python
- 23. Python Certification Training https://www.edureka.co/python Creating A New File open() method again ➢ file = open(“testfile.txt”, “x”) ➢ file = open(“testfile.txt”, “w”) To create a new file in Python, use the open() method, with one of the following parameters: "x" - Create - will create a file, returns an error if the file exist "a" - Append - will create a file if the specified file does not exist "w" - Write - will create a file if the specified file does not exist
- 24. Python Certification Training https://www.edureka.co/python Deletion Operations File Handling In Python
- 25. Python Certification Training https://www.edureka.co/python Deleting A File os.remove() function To delete a file, you must import the OS module, and run its os.remove() function: Example > import os > os.remove("demofile.txt") Deleting a folder? Example > import os > os.rmdir("myfolder") Check if file exists > import os > if os.path.exists("demofile.txt"): > os.remove("demofile.txt") > else: > print("The file does not exist")
- 26. Python Certification Training https://www.edureka.co/python Conclusion File Handling In Python
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