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Python中__name__的使用实例

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Release: 2016-06-06 11:25:30
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1. 如果模块是被导入,__name__的值为模块名字
2. 如果模块是被直接执行,__name__的值为'__main__'

Py1.py

代码如下:


#!/usr/bin/env python
def test():
 print '__name__ = ',__name__
if __name__ == '__main__':
 test()


Py2.py

代码如下:


#!/usr/bin/env python
import Py1.py
 
def test():
 print '__name__ = ',__name__
if __name__ == '__main__':
 test()
 print ‘Py1.py __name__ = ',Py1.__name__


执行结果:

代码如下:


__name__=__main__
Py1.py __name__=Py1


通过结果可以知道,Py2.py直接执行,那么内建变量__name__的值为__main__,否则为模块的名字,通过这个特性可以在if语句里面添加测试代码,可以提高减少BUG,提高程序的健壮性。

代码如下:


if __name__ == '__main__':
 test()

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