[New-bugs-announce] [issue35119] Customizing module attribute access example raises RecursionError

[Denis Osipov]

New submission from Denis Osipov <osipov_d at list.ru>:

Customizing module attribute access example raises RecursionError:

>>> import sys
>>> from types import ModuleType
>>> class VerboseModule(ModuleType):
...     def __repr__(self):
...         return f'Verbose {self.__name__}'
...     def __setattr__(self, attr, value):
...         print(f'Setting {attr}...')
...         setattr(self, attr, value)
...
>>> sys.modules[__name__].__class__ = VerboseModule
>>> sys.modules[__name__].a = 5
Setting a...
<...>
Setting a...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 6, in __setattr__
  File "<stdin>", line 6, in __setattr__
  File "<stdin>", line 6, in __setattr__
  [Previous line repeated 495 more times]
  File "<stdin>", line 5, in __setattr__
RecursionError: maximum recursion depth exceeded while calling a Python object
Setting a...>>>

Something like this can fix it:

def __setattr__(self, attr, value):
...         print(f'Setting {attr}...')
...         super().setattr(self, attr, value)

----------
assignee: docs at python
components: Documentation
messages: 328966
nosy: denis-osipov, docs at python
priority: normal
severity: normal
status: open
title: Customizing module attribute access example raises RecursionError
type: behavior
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35119>
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