CODEWITHSUNDEEP
pythonclassinheritance
Mersper
Mersper

Reputation: 97

How does python deal with this inheritance issue?

class A:
    def __init__(self):
        print('I am A')


class B(A):
    def b(self):
        print('I am B.b')


class C(A):
    def c(self):
        x.b()


if __name__ == '__main__':
    x = B()
    y = C()
    y.c()

How does it work when it comes to 'y.c() '? In C.c(), how can the instance x be called without instantiation before? Thanks a lot, if someone can help.

Upvotes: 0

Views: 39

Answers (1)

blue note
blue note

Reputation: 29071

It cannot. In your case, it just happens that when you call x.b() there is a global variable that happens to be named x have type B. It has been initialized at the previous line, with x = B().

This code depends on external variables, and will fail in general. If you want to call the objects own method, use self.b() instead.

Upvotes: 2

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