if __name__ == '__main__' 如何正确理解?

作者：知乎用户
链接：https://www.zhihu.com/question/49136398/answer/114437881
来源：知乎
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# 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")

# file two.py
import one

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

if __name__ == "__main__":
    print("two.py is being run directly")
else:
    print("two.py is being imported into another module")

如果你执行one.py文件，

python one.py

会输出：

top-level in one.py
one.py is being run directly

如果你执行two.py文件，

python two.py

会输出：

top-level in one.py
one.py is being imported into another module
top-level in two.py
func() in one.py
two.py is being run directly

Thus, when module one gets loaded, its __name__ equals "one" instead of __main__.

我就不翻译了首先我翻译的很丑其次我觉得英文更好理解。。。

它就是上面这么用的。

然后我觉得它的功能就是，让if __name__ == '__main__'它后面的代码不执行。这样代码运行会更简洁更流畅？？？因为只需要用想用的那部分就行了。。。