Skip to main content

19. Multiple Inheritance And MRO

Python supports multiple inheritance, controlled by Method Resolution Order (MRO).

Example​

class A: pass
class B: pass
class C(A, B): pass

print(C.__mro__)

Diamond Problem​

class A: 
    def greet(self): print("A")
class B(A): 
    def greet(self): print("B")
class C(A): 
    def greet(self): print("C")
class D(B, C): pass

print(D.__mro__)

Wrap-Up​

  • MRO defines method search order.
  • Inspect with .__mro__.