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| -rw-r--r-- | Doc/howto/descriptor.rst | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/Doc/howto/descriptor.rst b/Doc/howto/descriptor.rst index 7d787c1..e72386a 100644 --- a/Doc/howto/descriptor.rst +++ b/Doc/howto/descriptor.rst @@ -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 @@ -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: |