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Re: Flag control variable

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From Peter Otten <__peter__@web.de>
Subject Re: Flag control variable
Date Tue, 11 Feb 2014 18:46:40 +0100
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luke.geelen@gmail.com wrote:

> i'd like to know how to set up a flag to change a variable,
> for example, i want a simple script to combine 2 numbers,
> 
> 
> sum = num + another_num
> print "Now the sum of the numbers equals : ", sum
> 
> how could i make it so that if i type python ./script.py 21 41
> that i get the sum of 21 and 41 ?

You seem to be looking for sys.argv which contains the script name and the 
command-line arguments.

$ cat script.py
import sys
a = int(sys.argv[1])
b = int(sys.argv[2])
print a, "+", b, "=", a + b
$ python script.py 21 41
21 + 41 = 62

The conversion to int (or float etc.) is necessary because in python

>>> "21" + "41"
'2141'

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Flag control variable luke.geelen@gmail.com - 2014-02-11 09:29 -0800
  Re: Flag control variable Larry Martell <larry.martell@gmail.com> - 2014-02-11 12:44 -0500
  Re: Flag control variable Peter Otten <__peter__@web.de> - 2014-02-11 18:46 +0100
  Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 10:00 -0800
  Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 10:16 -0800
    Re: Flag control variable Tim Chase <python.list@tim.thechases.com> - 2014-02-11 12:32 -0600
  Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 10:37 -0800
    Re: Flag control variable Tim Chase <python.list@tim.thechases.com> - 2014-02-11 12:51 -0600
    Re: Flag control variable Peter Otten <__peter__@web.de> - 2014-02-11 19:51 +0100
      Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 11:01 -0800
        Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 11:06 -0800
          Re: Flag control variable Gary Herron <gary.herron@islandtraining.com> - 2014-02-11 11:26 -0800
          Re: Flag control variable Tim Chase <python.list@tim.thechases.com> - 2014-02-11 13:28 -0600
            Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 11:54 -0800
              Re: Flag control variable Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-11 20:02 +0000
        Re: Flag control variable Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-02-11 21:14 +0200
        Re: Flag control variable Gary Herron <gary.herron@islandtraining.com> - 2014-02-11 11:20 -0800
    Re: Flag control variable Gary Herron <gary.herron@islandtraining.com> - 2014-02-11 10:55 -0800
      Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 10:59 -0800
        Re: Flag control variable Gary Herron <gary.herron@islandtraining.com> - 2014-02-11 11:09 -0800
        Re: Flag control variable Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-11 19:08 +0000
  Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 11:55 -0800
    Re: Flag control variable Gary Herron <gary.herron@islandtraining.com> - 2014-02-11 12:19 -0800
      Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 13:18 -0800
        Re: Flag control variable Gary Herron <gary.herron@islandtraining.com> - 2014-02-11 15:47 -0800
          Re: Flag control variable luke.geelen@gmail.com - 2014-02-11 21:09 -0800
            Re: Flag control variable Dave Angel <davea@davea.name> - 2014-02-12 00:23 -0500
              Re: Flag control variable luke.geelen@gmail.com - 2014-02-12 07:32 -0800
                Re: Flag control variable Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 15:42 +0000
                Re: Flag control variable Dave Angel <davea@davea.name> - 2014-02-12 13:51 -0500
            Re: Flag control variable Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2014-02-12 17:10 +0100
              Re: Flag control variable luke.geelen@gmail.com - 2014-02-12 09:15 -0800
            Re: Flag control variable Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-12 20:46 -0500

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