Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #41933 > unrolled thread

Re: problem with sys import argv

Back to article view | Back to comp.lang.python

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: problem with sys import argv Dave Angel <davea@davea.name> - 2013-03-26 13:55 -0400
    Re: problem with sys import argv Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-03-26 21:12 +0100
      Re: problem with sys import argv Dave Angel <davea@davea.name> - 2013-03-26 16:48 -0400

#41933 — Re: problem with sys import argv

On 03/26/2013 01:26 PM, leonardo selmi wrote:
> hi python community,
>
> i wrote the following programm:
>
> from sys import argv
>
> script, userName = argv
> prompt = '> '
>
> print 'hi %s, i am the %s script' % (userName, script)
> print "i'd like to ask you a few questions."
> print 'do you like me %s' % userName
> likes = raw_input(prompt)
>
> print "where do you live %s?" % userName
> lives = raw_input(prompt)
>
> print 'what kind of computer do you have?'
> computer = raw_input(prompt)
>
> print """
> alright so you said %r about liking me.
> you live in %r. not sure where that is.
> and you have a %r computer. nice
> """ % (likes, lives, computer)
>
> and i got the following error:  Traceback (most recent call last):
> File "/var/folders/89/84z7tw3d3rv39gny3n2p963m0000gn/T/pythonInTerm.GUF6PWCM", line 3, in <module>
>    script, userName = argv
> ValueError: need more than 1 value to unpack
>
> what can i do?
>
> thanks!
>

Since the script takes a mandatory argument, run it with one.

python  myscript.py  Dave

Better would be to change the script to check len(argv) for exactly 2, 
and tell the user how he should have run it.



-- 
DaveA

[toc] | [next] | [standalone]

#41946

Dave Angel wrote:

> Since the script takes a mandatory argument, run it with one.
> 
> python  myscript.py  Dave
> 
> Better would be to change the script to check len(argv) for exactly 2,
> and tell the user how he should have run it.

I would use argparse.ArgumentParser instead.

<http://docs.python.org/dev/library/argparse.html>

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.

[toc] | [prev] | [next] | [standalone]

#41948

On 03/26/2013 04:12 PM, Thomas 'PointedEars' Lahn wrote:
> Dave Angel wrote:
>
>> Since the script takes a mandatory argument, run it with one.
>>
>> python  myscript.py  Dave
>>
>> Better would be to change the script to check len(argv) for exactly 2,
>> and tell the user how he should have run it.
>
> I would use argparse.ArgumentParser instead.
>
> <http://docs.python.org/dev/library/argparse.html>
>

As would I.  But that would be out of proportion of the rest of the 
code, and therefore presumably beyond the needs or interest of the OP.

-- 
DaveA

[toc] | [prev] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web