How to avoid diamond inheritance problems in Python?

In Python, the problem of diamond inheritance is solved thanks to the MRO (Method Resolution Order) mechanism, which determines the order of method search in the class hierarchy.

To avoid issues:

• Use the built-in MRO mechanism, which considers the inheritance order and allows correct calling of base class methods.
• When overriding methods in classes involved in diamond inheritance, call base class methods via super(). This guarantees that each method is called exactly once and in the correct order.

Example:

class A:
    def method(self):
        print("A")

class B(A):
    def method(self):
        super().method()
        print("B")

class C(A):
    def method(self):
        super().method()
        print("C")

class D(B, C):
    def method(self):
        super().method()
        print("D")

obj = D()
obj.method()

The output will be:

A
C
B
D

Thus, super() and MRO help avoid duplicate calls and problems of diamond inheritance.