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IDLE is unable to open any `.py` files

AlexWaygood

With a fresh CPython build (be0c106), IDLE is unable to open any .py files.

To reproduce:

  1. Create an empty .py file with the name repro.py
  2. Run python -m idlelib repro.py

IDLE still seems able to create new .py files and save them; it just can't open pre-existing .py files right now.

Traceback observed

C:\Users\alexw\coding\cpython>python -m idlelib repro.py
Running Debug|x64 interpreter...
Traceback (most recent call last):
  File "C:\Users\alexw\coding\cpython\Lib\runpy.py", line 198, in _run_module_as_main
    return _run_code(code, main_globals, None,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\alexw\coding\cpython\Lib\runpy.py", line 88, in _run_code
    exec(code, run_globals)
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\__main__.py", line 7, in <module>
    idlelib.pyshell.main()
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\pyshell.py", line 1640, in main
    if flist.open(filename) is None:
       ^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\filelist.py", line 37, in open
    edit = self.EditorWindow(self, filename, key)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\pyshell.py", line 135, in __init__
    EditorWindow.__init__(self, *args)
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\editor.py", line 289, in __init__
    self.set_indentation_params(is_py_src)
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\editor.py", line 1327, in set_indentation_params
    i = self.guess_indent()
        ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\editor.py", line 1574, in guess_indent
    opener, indented = IndentSearcher(self.text, self.tabwidth).run()
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\alexw\coding\cpython\Lib\idlelib\editor.py", line 1646, in run
    save_tabsize = tokenize.tabsize
                   ^^^^^^^^^^^^^^^^
AttributeError: module 'tokenize' has no attribute 'tabsize'

Environment

(Given the cause of the bug, the environment details shouldn't really be relevant; but they're included here anyway, for completeness.)

Python 3.12.0a7+ (heads/main:be0c106789, May 21 2023, 12:00:27) [MSC v.1932 64 bit (AMD64)] on win32

Reproduces on a debug and non-debug build, FWIW.

Linked PRs