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Programming FAQ: Mention object.__setattr__ as a technique for delegation #124617

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Sep 26, 2024
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Programming FAQ: Mention object.__setattr__ as a technique for delegation #124617

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JelleZijlstra Sep 26, 2024
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13 changes: 10 additions & 3 deletions Doc/faq/programming.rst
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Expand Up @@ -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?
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