if __name__ == '__main__' 如何正确理解?

出处：凌孜

貌似昨天还是前天看过这个~现学现卖一下，有错误的话大家走过路过请指正一下~谢谢！
我的理解是，呜呜为什么我感觉我可以理解但是说不出来。。。我是看下面这段代码懂了的，引用自python
- What does if __name__ == "__main__" do?其中Adam
Rosenfield的回答。

# 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。。。