[docs] A badly documented page

[Dhananjay Naniwadekar]

Refer, please : https://docs.python.org/2/howto/argparse.html
    Search for the first instance of : args.square
When you want to show that : Square of 5 is 25, calling the number '5'
args.square is very counterintuitive. If you call it args.base_number, it
does not at once tell whether the square or cube or root of the base is
being calcaulated. Calling it args.num_to_be_squared is too long. But
calling it args.square is so confusing.

print  args.num**2    ## print the square of the number
   reads better, and is not confusing.

- dn
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