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From: Dave Angel <davea@davea.name>
Subject: Re: Flag control variable
Date: Wed, 12 Feb 2014 00:23:14 -0500 (EST)
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Xref: csiph.com comp.lang.python:65998

 luke.geelen@gmail.com Wrote in message:
> Can I make it that if
> C = int(sys.argv[3]) 
> But when I only enter 2 argumentvariable it sets c automaticly to 0 or 1
> 

Why do you ask for 'automatically'? You're the programmer,  write
 the test in the code. 

if len (sys.argv) == 3:
    sys.argv. append ("0")

But of course there are lots of other things you need to check, 
 so consider all of them at the same time. 

-- 
DaveA