????__name__

?????鶼????????????????п????????????????????????????????????????á????????????????????????鱻???????????????????????齫?????С??????????????????????????????????飬?????????????????????????????飬?????????????????????????__name__??????ɡ?

???????__name__

??8.2 ???????__name__

#!/usr/bin/python
# Filename: using_name.py

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

????????code/using_name.py??

???

$ python using_name.py
This program is being run by itself

$ python
>>> import using_name
I am being imported from another module
>>>

????ι???

???Python??鶼??????__name__?????????'__main__'????????????鱻??????????У?????????????????????????