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newb: What is the purpose of if __name__ == "__main__":

What is the purpose of
if __name__ == "__main__":

If you have a module, does it get called automatically?

Dec 7 '06 #1
3 2303
johnny wrote:
What is the purpose of
if __name__ == "__main__":

If you have a module, does it get called automatically?

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

Dec 7 '06 #2
johnny wrote:
What is the purpose of
if __name__ == "__main__":

If you have a module, does it get called automatically?
It is a common pattern to make one and the same source file usable as a
program and as a module. When you import some python module its
__name__ is never "__main__". When you run a python script __name__ is
always "__main__". This way you can control what shall happen when you
run the source file as a standalone program.

To put it simple: Everything in the `if __name__ == "__main__": ` block
is only executed when you run the source file as a program.

Hope that helps,
Soni Bergraj
Dec 7 '06 #3
"johnny" <ra*******@gmai l.comwrites:
What is the purpose of
if __name__ == "__main__":

\ "He that would make his own liberty secure must guard even his |
`\ enemy from oppression." -- Thomas Paine |
_o__) |
Ben Finney

Dec 7 '06 #4

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