[Python知识库]关于if __name__ == ‘__main__‘ python

经常在代码中看到这样一行命令，经常忘记什么意思，记录一下

if __name__ == '__main__' python

任何在if __name__ == '__main__' python之后的代码只有在明确运行这个文件时才会运行。

比如有一个.py文件：

# Filename: using_name.py

if __name__ == '__main__':
    print 'This program is being run by itself'
else:
    print 'I am being imported from another module'

• 直接运行这个脚本

python using_name.py

结果：

This program is being run by itself

• 引用这个脚本

python
import using_name

结果：

This program is being run by itself