https://github.com/python/cpython/commit/ce63ea0fe42b8934af7aeb69979f1cd2d526b8c6 commit: ce63ea0fe42b8934af7aeb69979f1cd2d526b8c6 branch: 3.13 author: Miss Islington (bot) <[email protected]> committer: Yhg1s <[email protected]> date: 2024-09-26T13:55:08-07:00 summary:
[3.13] Programming FAQ: Mention object.__setattr__ as a technique for delegation (GH-124617) (#124624) Programming FAQ: Mention object.__setattr__ as a technique for delegation (GH-124617) This is used for example by threading.local in the stdlib. (cherry picked from commit 43979fad904bcc343f90cb526faa526c45fcbfa4) Co-authored-by: Jelle Zijlstra <[email protected]> files: M Doc/faq/programming.rst diff --git a/Doc/faq/programming.rst b/Doc/faq/programming.rst index 4a6f1ca57d89e3..fa7b22bde1dc6f 100644 --- a/Doc/faq/programming.rst +++ b/Doc/faq/programming.rst @@ -1613,9 +1613,16 @@ method too, and it must do so carefully. The basic implementation of self.__dict__[name] = value ... -Most :meth:`!__setattr__` implementations must modify -:attr:`self.__dict__ <object.__dict__>` to store -local state for self without causing an infinite recursion. +Many :meth:`~object.__setattr__` implementations call :meth:`!object.__setattr__` to set +an attribute on self without causing infinite recursion:: + + class X: + def __setattr__(self, name, value): + # Custom logic here... + object.__setattr__(self, name, value) + +Alternatively, it is possible to set attributes by inserting +entries into :attr:`self.__dict__ <object.__dict__>` directly. How do I call a method defined in a base class from a derived class that extends it? _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/python-checkins.python.org/ Member address: [email protected]
