Look through the MRO (Method Resolution Order), using inspect.getmro()
(which works on both old and new-style classes):
def class_for_method(cls, method):
return next((c for c in inspect.getmro(cls)
if method.__func__ in vars(c).values()), None)
There is currently no stdlib method to do this search for you, no.
Demo:
>>> import inspect
>>> def class_for_method(cls, method):
... return next((c for c in inspect.getmro(cls)
... if method.__func__ in vars(c).values()), None)
...
>>> class Base1(object):
... def foo(self): pass
...
>>> class Base2(object):
... pass
...
>>> class ClassA(Base1, Base2):
... pass
...
>>> class_for_method(ClassA, ClassA.foo)
<class '__main__.Base1'>
If no base class is found, the above expression returns None
:
>>> class Bar:
... def spam(): pass
...
>>> class_for_method(ClassA, Bar.spam) is None
True