[Tutor] '__name__' == '__main__'

[Christian Witts]

On 2012/02/21 06:55 AM, Michael Lewis wrote:
> I am back to being confused. I just tried running the module without 
> first importing it, and it worked just fine. How do I do this properly 
> to where the module only runs if I import it?
>
> Code:
>
> def MultiplyText(text, multiplier):
>     '''Recieve a S & int. For digits in S, multiply by multiplier and 
> return updated S.'''
>     return ' '.join(str(int(num) * multiplier) if num.isdigit() else 
> num for num in text)
>
>
> def GetUserInput():
>     '''Get S & multiplier. Test multiplier.isdigit(). Call 
> MultiplyText(text, multiplier)'''
>     text = raw_input('Enter some text: ')
>     while True:
>         multiplier = raw_input('Enter a multiplier: ')
>         try:
>             multiplier = int(multiplier)
>             break
>         except ValueError:
>             continue
>     return MultiplyText(text.split(), multiplier)
>
>
> if "__name__" == '__main__':
>     GetUserInput()
>
> What I did in IDLE:
>
> >>>
> >>> GetUserInput()
> Enter some text: 4 times
> Enter a multiplier: 2
> '8 times'
> >>>
>
> -- 
> Michael J. Lewis
> mjolewis at gmail.com <mailto:mjolewis at gmail.com>
> 415.815.7257
>
>
>
> _______________________________________________
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If you change '__main__' to the name of the file, without the extension, 
it will match __name__.
Alternatively, you can have an else after your `__name__ == '__main__'`

$ cat t1.py
if __name__ == '__main__':
     print 'Executed from __main__'

if __name__ == 't1':
     print 'Executed by import from t2'

$ cat t2.py
import t1

$ python t1.py
Executed from __main__

$ python t2.py
Executed by import from t2

$ cat t3.py
if __name__ == '__main__':
     print 'Executed from __main__'
else:
     print 'Executed by import'

$ cat t4.py
import t3

$ python t3.py
Executed from __main__

$ python t4.py
Executed by import

-- 

Christian Witts
Python Developer

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