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gh-139707: Better ModuleNotFoundError message for missing stdlib modules (GH-140219)

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Stan Ulbrych 2025-10-21 08:12:04 +01:00 • committed by GitHub
parent b2f9fb9db2
commit 47d2f68df2
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3 changed files with 24 additions and 7 deletions
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13
Lib/traceback.py
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@ -1107,11 +1107,14 @@ def __init__(self, exc_type, exc_value, exc_traceback, *, limit=None,
suggestion = _compute_suggestion_error(exc_value, exc_traceback, wrong_name)
if suggestion:
self._str += f". Did you mean: '{suggestion}'?"
elif exc_type and issubclass(exc_type, ModuleNotFoundError) and \
sys.flags.no_site and \
getattr(exc_value, "name", None) not in sys.stdlib_module_names:
self._str += (". Site initialization is disabled, did you forget to "
+ "add the site-packages directory to sys.path?")
elif exc_type and issubclass(exc_type, ModuleNotFoundError):
module_name = getattr(exc_value, "name", None)
if module_name in sys.stdlib_module_names:
self._str = f"Standard library module '{module_name}' was not found"
elif sys.flags.no_site:
self._str += (". Site initialization is disabled, did you forget to "
+ "add the site-packages directory to sys.path "
+ "or to enable your virtual environment?")
elif exc_type and issubclass(exc_type, (NameError, AttributeError)) and \
getattr(exc_value, "name", None) is not None:
wrong_name = getattr(exc_value, "name", None)