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Re: Flag control variable

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Date Tue, 11 Feb 2014 11:20:27 -0800
From Gary Herron <gary.herron@islandtraining.com>
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Subject Re: Flag control variable
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On 02/11/2014 11:01 AM, luke.geelen@gmail.com wrote:
> when using python script.py 2 \* 2 i get Traceback (most recent call 
> last): File "math2.py", line 5, in <module> sign = int(sys.argv[2]) 
> ValueError: invalid literal for int() with base 10: '*' 

Stop trying to guess what is going on.  Print out sys.argv, and *see* 
what values are there.  Then read the error message.

You wrote your script expecting sys.argv[2] to contain an int, but in 
fact (according to the error) it contains a '*' -- which can't be 
converted to an integer obviously.  Your error is in running the script 
incorrectly, *OR* in your understanding of how the command line 
arguments get placed in sys.argv.  In either case you best bet is to 
examine sys.argv by printing it (or examining it within a debugger) and 
*see* what values it contains.  Then adjust your script (or the running 
of it) accordingly.

These are very beginner level debugging suggestions.  If you develop the 
skill to read and understand the error messages, and the skill to print 
(or otherwise examine) the values your program is dealing with, you 
progress will by 100's of times faster then this slow wait for someone 
to respond to on this list.

Gary Herron

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Thread

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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