What is the python entry function?

The python entry function is [if __name__ == "__main__"], [print (__name__)] prints [__main__], that is to say, when a module is called as a whole, the module name [ The value of __name__] is [__main__].

Usage of entry function

First code

#这是一个测试函数
import time 
    
def func():
    print("666")
if __name__ == "__main__":
    print("222") 
    func()
print（__name__）
print(time.__name__)

If you execute this py file directly, the output will be 222 and 666, here you can see that if __name__ == "__main__": is executed by us as an entry.

The print result of the last two sentences of the above code is:

print (__name__) The printed result is __main__, that is to say, when a module is called as a whole, the value of the module name .__name__ is __main__.

print(time.__name__)When a module is referenced by other modules, the output will be the module's own name. When a module is referenced by other modules, it does not An entry function is required.

The above explains well why the entry function is needed.

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