Inheritance of Classes | Python Fiddle

class Customer(object):
    """Produces objects that represent customers."""
    def __init__(self, customer_id):
        self.customer_id = customer_id

def display_cart(self):
        print "I'm a string that stands in for the contents of your shopping cart!"

class ReturningCustomer(Customer):
    """For customers of the repeat variety."""
    def display_order_history(self):
        print "I'm a string that stands in for your order history!"

monty_python = ReturningCustomer("ID: 12345")
monty_python.display_cart()
monty_python.display_order_history()

##Inheritance is a tricky concept, so let's go through it step by step.

##Inheritance is the process by which one class takes on the attributes and methods of another, and it's used to express an is-a relationship. 
#For example, a Panda is a bear, so a Panda class could inherit from a Bear class. However, a Toyota is not a Tractor, 
#so it shouldn't inherit from the Tractor class (even if they have a lot of attributes and methods in common). 
#Instead, both Toyota and Tractor could ultimately inherit from the same Vehicle class.

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