Building a formal interface with ABC
Formal interfaces offer a more enforceable contract between an interface and any classes that implement it. You'll practice creating a formal interface made up of two abstract methods, using the abc module. The ABC class and abstractmethod decorator have been imported from abc. Have fun!
This exercise is part of the course
Intermediate Object-Oriented Programming in Python
Exercise instructions
- Create a formal interface, called
Product. - Define
purchase()as an abstract method with parametersselfandquantity, and add thepasskeyword to the method body. - Define the
update_price()abstract method, which takes parametersselfandnew_price.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Create a Product interface
____ ____(____):
# Define a purchase() abstract method
____
def ____(____, quantity):
____
# Create an update_price() abstract method
____
def ____(self, ____):
____