New submission from Juchen Zeng:
[Doc Link](https://docs.python.org/2/howto/descriptor.html#invoking-descriptors)
In descriptions about how to invoke descriptors with super(), it says:
The call super(B, obj).m() searches obj.__class__.__mro__ for the base
class A immediately following B and then returns A.__dict__['m'].__get__(obj,
B). If not a descriptor, m is returned unchanged. If not in the dictionary, m
reverts to a search using object.__getattribute__().
But the call ` super(B, obj).m()` will not return `A.__dict__['m'].__get__(obj,
B)`, it will trigger the `__call__` method of ` A.__dict__['m'].__get__(obj,
B)` if it has that attr, and return what this `__call__` method returns. It
could be anything.
It's actually `super(B, obj).m` returns `A.__dict__['m'].__get__(obj, B)` if m
is a descriptor.
In short, the original description in the doc can be abbreviated to:
`The call super(B, obj).m() [did something] and returns
A.__dict__['m'].__get__(obj, B).`
Which is obviously misleading.
As the method/function call isn't the core part in this sentence. I suggest the
doc to be fixed like this:
The action super(B, obj).m searches obj.__class__.__mro__ for the base
class A immediately following B and then returns A.__dict__['m'].__get__(obj,
B).
----------
assignee: docs@python
components: Documentation
messages: 255712
nosy: Juchen Zeng, docs@python, martin.panter
priority: normal
severity: normal
status: open
title: Misleading descriptions in docs about invoking descriptors.
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue25777>
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