raghu raghu wrote:
> i have a clarification regarding built in function,in some scripts it
> is being used and it is give n: if _name_ == '_main_'
> why this is being used in the scripts?
The global variable __name__ is equal to '__main__' when the python
script is run.
If the script is imported, __name__ is something other than '__main__'
(not sure what.)
So by checking if __name__ == '__main__' we can ensure that our code can
work both as a standalone script
and as a module.
For example:
#test-script.py
import random
def someFunction(a):
return a * random.randrange(100)
if __name__ == "__main__":
print "The number 42 passed to someFunction is: " + someFunction(42)
#-----
If we want to use the function someFunction from test-script.py in a
different file,
the 'main' part won't be run.
#
import test-script
print "The number 3 passed to someFunction is: " + someFunction(3)
#-------------
if the 'if __name__ == '__main__' ' test weren't in the original
test-script.py,
the 42 version of the print statement would be run whenever someone
imported it.
HTH,
-Luke
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