New submission from Paul Pinterits <[email protected]>:
The [descriptor
howto](https://docs.python.org/3/howto/descriptor.html#invoking-descriptors)
states:
"For example, obj.d looks up d in the dictionary of obj. If d defines the
method __get__(), then d.__get__(obj) is invoked [...]"
This is not true - the descriptor obtained from obj's dictionary is never
invoked. If it was, the following two snippets would produce output:
class Class:
pass
obj = Class()
obj.__dict__['d'] = property(lambda: print('called'))
_ = obj.d # nothing is printed.
class Obj:
@property
def d(self):
print('called')
_ = Obj.d # nothing is printed.
----------
assignee: docs@python
components: Documentation
messages: 303968
nosy: Paul Pinterits, docs@python
priority: normal
severity: normal
status: open
title: Documentation incorrectly states how descriptors are invoked
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue31735>
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