Hi, Ganesh ! An important use of this feature is the so-called modular testing, aka unit testing. I mean: that way you can provide functionality in your module to test it independently of any application it may be contained in.
Unit testing in general is easier and quicker to do than to test the whole application in which any given module is contained, along with probably lots of other modules. The Wikipedia article Unit Testing, at https://secure.wikimedia.org/wikipedia/en/wiki/Unit_testing will make things clear. All the best, hilton On Fri, May 20, 2011 at 8:31 AM, Christian Witts <cwi...@compuscan.co.za> wrote: > On 2011/05/20 01:29 PM, Christian Witts wrote: >> >> On 2011/05/20 01:09 PM, Ganesh Kumar wrote: >>> >>> Hi Gurus, >>> >>> I am new python programming.. I see many programs >>> if __name__ == '__main__': >>> when I check __name__ always eq __main__. >>> what purpose use these structure.. please guide me.. >>> >>> -Ganesh >>> >> >> If you execute the script directly ie. python script.py the __name__ >> will be __main__ but if you import it it's the name of the file. >> >> #first.py >> print __name__ >> >> #second.py >> import first >> >> $ python first.py >> __main__ >> >> $ python second.py >> first >> > > Sorry, forgot to add before sending that the reason I use the `if __name__ > == '__main__'` structure is so that I can have a standalone application that > has it's defined entry point and then if I want to reuse functions in the > application I can import it without having to worry that it will execute the > entire thing. > > -- > Christian Witts > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
