How to use the entry function in Python

Usage of the entry function

First on the code

# This is a test function Import Time      def func ():     Print ("666") if __name__ " __main__ " :     Print ("222")     func ()

Print (__name__)
Print (time.__name__)

　

If you execute the PY file directly, the output is 222 and 666, and here you can see if __name__ = = "__main__": is executed as a portal by us.

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

Print (__name__) prints the __main__, which means that 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 need an entry function itself.

It's a good explanation of why you need an entry function.

How to use the entry function in Python