How do I implement multiple inheritance in Python?

How do I implement multiple inheritance in Python?

In Python, you can implement multiple inheritance by defining a class that inherits from multiple parent classes. For example:

class Parent1:
    def method1(self):
        return 'Method from Parent1'

class Parent2:
    def method2(self):
        return 'Method from Parent2'

class Child(Parent1, Parent2):
    pass

child_instance = Child()
print(child_instance.method1())  # Output: Method from Parent1
print(child_instance.method2())  # Output: Method from Parent2

Are there any issues I should be aware of with multiple inheritance?

Yes, one common issue is the "Diamond Problem," where a class inherits from two classes that have a common ancestor. This can lead to ambiguity in method resolution. Python uses the C3 linearization algorithm to resolve this.

Can you give me an example of the Diamond Problem?

Sure! Here's a simple example:

class A:
    def method(self):
        return 'Method from A'

class B(A):
    pass

class C(A):
    pass

class D(B, C):
    pass

instance = D()
print(instance.method())  # Which method will be called?

How can I resolve the Diamond Problem in my code?

You can resolve the Diamond Problem by explicitly defining which parent class's method to use in the child class. For example:

class D(B, C):
    def method(self):
        return B.method(self)  # Explicitly calling method from class B