python's @abstractmethod

1、 Write in front

Since python does not have the concept of abstract classes and interfaces, the abc.py class library is needed to realize this function

2、@ abstractmethod features###

@ abstractmethod: abstract method. Classes containing abstractmethod methods cannot be instantiated. Subclasses that inherit the abstractmethod method must override all abstractmethod-decorated methods. Those that are not decorated can not be rewritten.

3、 Take a negative example (instantiate abstract class)

4、 Give a normal example###

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