Python 3 programing abstract base classes
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abstract base classes (abcs) in python are a way of defining a common interface for a group of related classes. they are used to define a set of methods that must be implemented by any subclass that inherits from the abc.
to create an abstract base class in python 3, you need to use the `abc` module. here's a step-by-step tutorial with a code example:
1. import the `abc` and `abstractmethod` decorators from the `abc` module:
2. define your abstract base class by creating a class that inherits from `abc`:
in the above example, `shape` is an abstract base class with two abstract methods `area` and `perimeter`. any subclass that inherits from `shape` must implement these two methods, otherwise, a `typeerror` will be raised.
3. create a subclass that inherits from the abstract base class and implements the required methods:
in this example, `circle` is a subclass of `shape` and it implements the `area` and `perimeter` methods as required by the abstract base class.
4. instantiate the subclass and use its methods:
when you run the above code, you should see the calculated area and perimeter of the circle being printed.
abstract base classes are useful for defining a common interface for a group of classes, enforcing a specific structure in subclasses, and providing clear documentation for expected behavior. they help in organizing code and ensuring consistency in implementations.
remember that abstract methods must be implemented in subclasses, otherwise, python will raise an error at runtime.
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