Python Multiple Inheritance

Python Multiple Inheritance

Python supports multiple inheritance too. It allows us to inherit multiple parent classes. We can derive a child class from more than one base (parent) classes.

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The multiderived class inherits the properties of both classes base1 and base2.

Let's see the syntax of multiple inheritance in Python.

Python Multiple Inheritance Syntax
class DerivedClassName(Base1, Base2, Base3): 
    <statement-1> 
    . 
    . 
    . 
    <statement-N>  

Or

class Base1: 
    pass 
 
class Base2: 
    pass 
 
class MultiDerived(Base1, Base2): 
    pass  

Python Multiple Inheritance Example

class First(object):
  def __init__(self):
    super(First, self).__init__()
    print("first")

class Second(object):
  def __init__(self):
    super(Second, self).__init__()
    print("second")

class Third(Second, First):
  def __init__(self):
    super(Third, self).__init__()
    print("third")

Third();

Output:
first 
second 
third 

Why super () keyword

The super() method is most commonly used with __init__ function in base class. This is usually the only place where we need to do some things in a child then complete the initialization in the parent.

See this example:
class Child(Parent): 
    def __init__(self, stuff): 
        self.stuff = stuff 
        super(Child, self).__init__() 
Composition in Python

Composition is used to do the same thing which can be done by inheritance.