python - 为什么要使用def main（）？ [重复](Why use def main()? [duplicate])

Question

Possible Duplicate:

(可能重复：)
What does if __name__== "__main__" do?

(if __name__== "__main__"怎么办？)

I've seen some code samples and tutorials that use

(我见过一些使用的代码示例和教程)

def main():
    # my code here

if __name__ == "__main__":
    main()

But why?

(但为什么？)

Is there any reason not do define your functions at the top of the file, then just write code under it?

(是否有任何理由不在文件顶部定义您的函数，然后只在其下编写代码？)

ie

(即)

def my_function()
    # my code here

def my_function_two()
    # my code here

# some code
# call function
# print(something)

I just wonder if there is any rhyme to the main?

(我只是想知道主要有没有押韵？)

  ask by Wizzard translate from so

Answer 1

如果没有主要的标记，即使脚本作为模块导入，代码也会被执行。