Pycharm warning Must implement all abstract methods in Python Why

Question

Code

class A(object):
    def a(self):
        raise NotImplementedError

class B(A):
    def a(self):
        return 7

class C(B):
    pass

Why does Pycharm complain?

Problem synopsis      Class C must implement all abstract methods

Answer 1

n vote

As expected, python itself recognises that instances of Class C are valid. So I suspected an bug in PyCharm.

It will be fixed soon I hope!