if __name__ == "__main__"如何正确理解

粗略来讲，__name__是当前模块，当模块被直接运行时模块名为__main__。这句话的意思是，当模块被直接执行时，代码将运行，当模块是被导入时，代码不被运行

例如，执行one.py

 # file one.py

 def func():

     print("func() in one.py")

 print("top-level in one.py")

 if __name__ == "__main__":

     print("one.py is being run directly")

 else:

     print("one.py is being imported into another module")

　　运行结果：

　　执行two.py:

 # file two.py

 import one

 print("top-level in two.py")

 one.func()

 if __name__ == "__main__":

     print("two.py is being run directly")

 else:

　　运行结果：

巴特西

if name == "main"如何正确理解

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