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On 22/03/12 09:57, ken brockman wrote:
>> PS Another odd bit, was on the python docs page. It had said that using
>> import File_name, without the .py would import it, but not run it. Seems
>> a glaring oversight not to have mentioned, what would have made it run.
>Actually it does run it when you import, just not the bit after the
>if __name__ = "__main__".
>The point of modules is that you don't usually want them to run as a program,
>you import them so as to get access to the >functions within them. You want to
>control when they are called from your own code.
>-- Alan G
Thank you once more Alan, for taking the time to try to enlighten me. I had
gone back to the python site, to try to get a better understanding of what it
had said, with your insight in mind. But I think i am more befuddled now then i
had been prior, If that is humanly possible. Below an excerpt from the python
site, (2.7) but i think it is still applicable.
------------------------------------------------
6.1.1. Executing modules as scripts
When you run a Python module with
python fibo.py <arguments>
the code in the module will be executed, just as if you imported it, but with
the __name__ set to "__main__". That means that by adding this code at the end
of your module:
if __name__ == "__main__":
import sys
fib(int(sys.argv[1]))
you can make the file usable as a script as well as an importable module,
because the code that parses the command line only runs if the module is
executed as the “main” file:
$ python fibo.py 50
If the module is imported, the code is not run:
----------------------------------------------------
Please bare with me, as I had said, I am a total novice. So if I understand
this, which Is highly unlikely the, If __name__==__main__, is what makes the
module run as a stand alone script? Which shouldn't effect it's usability as a
module which is imported? So why was it, that I couldn't get it to run without
including that bit in my main python program. And I am assuming the line I had
mistook to mean the module wouldn't run, means instead that the "name ==main
won't run, which once again leads to the question, then why would i need
to include it to make it function??
Do you see my point. What am i missing here? Some vital piece of the puzzle
seems to be eluding me.
Ken
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