PyREPL exits the interpreter on specific input

[warsaw]

Bug report

Bug description:

Playing with the Python 3.13.0 interpreter installed from brew on macOS 14.7 in a Terminal window.

I entered the repl and typed

>>> import math
>>> math.tau
6.283185307179586

Then I hit ctrl-P to get the last line and hit SPC, /, 2. Oddly, the SPC got eaten and the slash ended up right next to the u. I didn't notice that until I hit Enter, at which point the exception occurred and exited the interpreter.

Unfortunately, I cannot reproduce it again.

% python3
Python 3.13.0 (main, Oct  7 2024, 05:02:14) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import math
>>> math.tau
6.283185307179586
>>> math.tau/ 2
SyntaxError: source code string cannot contain null bytes (<python-input-2>)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/_pyrepl/__main__.py", line 6, in <module>
    __pyrepl_interactive_console()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/_pyrepl/main.py", line 59, in interactive_console
    run_multiline_interactive_console(console)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/_pyrepl/simple_interact.py", line 160, in run_multiline_interactive_console
    more = console.push(_strip_final_indent(statement), filename=input_name, _symbol="single")  # type: ignore[call-arg]
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/code.py", line 313, in push
    more = self.runsource(source, filename, symbol=_symbol)
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/_pyrepl/console.py", line 179, in runsource
    self.showsyntaxerror(filename, source=source)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/_pyrepl/console.py", line 165, in showsyntaxerror
    super().showsyntaxerror(filename=filename, **kwargs)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/code.py", line 115, in showsyntaxerror
    self._showtraceback(typ, value, None, source)
    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Cellar/python@3.13/3.13.0_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/code.py", line 140, in _showtraceback
    and not value.text and len(lines) >= value.lineno):
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '>=' not supported between instances of 'int' and 'NoneType'

CPython versions tested on:

3.13

Operating systems tested on:

macOS

Linked PRs

• gh-125666: Avoid PyREPL exiting when a null byte is in input #125732
• [3.13] gh-125666: Avoid PyREPL exiting when a null byte is in input (GH-125732) #126023

[devdanzin]

Maybe #88575 has a clue about when SyntaxError.lineno can be None?

Is it possible that instead of eating the space some invisible character got inserted?

Edit: oh, it says right on the error that the issue was a null byte.

[devdanzin]

Aha, I can reproduce on Linux by pressing Ctrl+Shift+@ followed by Enter:

>>>
SyntaxError: source code string cannot contain null bytes (<python-input-5>)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/home/ubuntu/projects/cpython/Lib/_pyrepl/__main__.py", line 6, in <module>
    __pyrepl_interactive_console()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/ubuntu/projects/cpython/Lib/_pyrepl/main.py", line 59, in interactive_console
    run_multiline_interactive_console(console)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/ubuntu/projects/cpython/Lib/_pyrepl/simple_interact.py", line 160, in run_multiline_interactive_console
    more = console.push(_strip_final_indent(statement), filename=input_name, _symbol="single")  # type: ignore[call-arg]
  File "/home/ubuntu/projects/cpython/Lib/code.py", line 312, in push
    more = self.runsource(source, filename, symbol=_symbol)
  File "/home/ubuntu/projects/cpython/Lib/_pyrepl/console.py", line 179, in runsource
    self.showsyntaxerror(filename, source=source)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/projects/cpython/Lib/_pyrepl/console.py", line 165, in showsyntaxerror
    super().showsyntaxerror(filename=filename, **kwargs)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/projects/cpython/Lib/code.py", line 114, in showsyntaxerror
    self._showtraceback(typ, value, None, source)
    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/projects/cpython/Lib/code.py", line 139, in _showtraceback
    and not value.text and len(lines) >= value.lineno):                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '>=' not supported between instances of 'int' and 'NoneType'

Edit Ctrl+Space followed by Enter also works, it's probably what you typed by accident.

[devdanzin]

This can be closed since #125732 and #126023 were merged.