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gh-128720: Fix doc inacurracy about __main__.__file__ existence in the REPL #128721

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Jan 21, 2025
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gh-128720: Fix doc inacurracy about __main__.__file__ existence in the REPL #128721

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10 changes: 2 additions & 8 deletions Doc/library/__main__.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -292,10 +292,7 @@ Here is an example module that consumes the ``__main__`` namespace::
if not did_user_define_their_name():
raise ValueError('Define the variable `my_name`!')

if '__file__' in dir(__main__):
print(__main__.my_name, "found in file", __main__.__file__)
else:
print(__main__.my_name)
print(__main__.my_name)

Example usage of this module could be as follows::

Expand Down Expand Up @@ -330,7 +327,7 @@ status code 0, indicating success:
.. code-block:: shell-session

$ python start.py
Dinsdale found in file /path/to/start.py
Dinsdale

Note that importing ``__main__`` doesn't cause any issues with unintentionally
running top-level code meant for script use which is put in the
Expand Down Expand Up @@ -361,8 +358,5 @@ defined in the REPL becomes part of the ``__main__`` scope::
>>> namely.print_user_name()
Jabberwocky

Note that in this case the ``__main__`` scope doesn't contain a ``__file__``
attribute as it's interactive.

Comment on lines -364 to -366
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We may want to keep this line, depending on the resolution of the issue. I agree with the changes above.

The ``__main__`` scope is used in the implementation of :mod:`pdb` and
:mod:`rlcompleter`.
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