[Tutor] Running python from windows command prompt

[Asokan Pichai]

On Thu, Apr 11, 2013 at 11:38 AM, Arijit Ukil <arijit.ukil at tcs.com> wrote:

> Thanks for the help. Now I have modifed the code as:
>
> import sys
>
> def main(argv):
>
>     data = int(sys.argv[1])
>
>     avg = average (data)
>
>     print "Average:", avg
>
> def average(num_list):
>     return sum(num_list)/len(num_list)
>
> if __name__ == "__main__":
>    main(sys.argv[1:])
>


Two major problems:
One:
The __main__ methods processes (correctly) the args and drops argv[0]

But your main() function is calling sys.argv again

Two:
sum() and len() expect a list -- more accurately an iterable.
when you say
 data = argv[1]
data is a scalar.

If you know of list comprehensions, it can be easier or else,
think of a function to convert a list of strings (argv[1:] to a list
of floats; more general than int)

--------------------
def arg2list(arg):
      args = []
      for a in arg:
           args.append(float(a))
      return args
--------------------
Now replace the data = line with

data = arg2list(argv) # NOT sys.argv

HTH

Asokan Pichai

"Expecting the world to treat you fairly because you are a good person is a
little like expecting the bull to not attack you because you are a
vegetarian"
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