Find the issue in this multiple inheritance example:

Find the issue in this multiple inheritance example:

class A:
    def process(self):
        print('A process')

class B(A):
    def process(self):
        print('B process')

class C(A):
    def process(self):
        print('C process')

class D(B, C):
    def process(self):
        B.process(self)
        C.process(self)

obj = D()
obj.process()