What is the special method of python and how to use it
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description
In a class, methods that begin and end with__are special methods, and special methods have special uses. They can be called directly or indirectly via built-in functions or operators such as__init__(),__next__().
Examples of special methods
__init__() is used for initialization of objects.
__init__() is typically a special method used to initialize objects. Called automatically during class instantiation.
Next() calls iterator__next__()
Calling next() on the iterator generates the next value. Behind this procedure, next() calls the iterator__next__().
When len() is called, the container's__len__() method is automatically called.
Calling len() returns the length of a container. The reason is that the__len__() method is implemented in the container class, and when the len() function is called, the__len__() method of the container is automatically called.
Using print() will automatically call__str__.
example code
class A: def __str__(self): Python is a programming language with many effective tools built in. Python is almost omnipotent. The language is easy to understand, easy to get started, powerful, and widely used in many fields, such as the most popular big data analysis, artificial intelligence, Web development, etc.
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