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Feb 20, 2024
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gh-113157: Document and test __get__ for MethodType #115492

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gh-113157: Document and test __get__ for MethodType
rhettinger Feb 14, 2024
af77989
Make signature match the test case
rhettinger Feb 15, 2024
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20 changes: 18 additions & 2 deletions Doc/howto/descriptor.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1192,6 +1192,10 @@ roughly equivalent to:
"Emulate method_getattro() in Objects/classobject.c"
return getattr(self.__func__, name)

def __get__(self, obj, objtype=None):
"Emulate method_descr_get() in Objects/classobject.c"
return self

To support automatic creation of methods, functions include the
:meth:`__get__` method for binding methods during attribute access. This
means that functions are non-data descriptors that return bound methods
Expand All @@ -1214,8 +1218,20 @@ descriptor works in practice:
.. testcode::

class D:
def f(self, x):
return x
def f(self):
return self

class D2:
pass

.. doctest::
:hide:

>>> d = D()
>>> d2 = D2()
>>> d2.f = d.f.__get__(d2, D2)
>>> d2.f() is d
True

The function has a :term:`qualified name` attribute to support introspection:

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