[Tutor] Beginner puzzle with unpacking argv

[Lisi]

On Thursday 16 June 2011 19:03:27 Joel Goldstick wrote:
> On Thu, Jun 16, 2011 at 1:10 PM, Lisi <lisi.reisz at gmail.com> wrote:
> > Copied and pasted:
> > >From text of Learn Python the Hard Way
> >
> > 1 from sys import argv
> > 2
> > 3 script, user_name = argv
> >
> > >From my script (typed, not copied and pasted, but copied and pasted from
> >
> > my
> > script to here):
> >
> > 1 from sys import argv
> > 2
> > 3 script, user_name = argv
> >
> > I have tried every permutation of white space I could think of that might
> > have
> > looked like the original, but I always get the same error:
> >
> > lisi at Tux:~/Python/LearnPythonTheHardWay$ python ex14.py
> > Traceback (most recent call last):
> >  File "ex14.py", line 3, in <module>
> >    script,  user_name=argv
> > ValueError: need more than 1 value to unpack
> >
> > I haven't got past line 3 yet!!  I know that you need the right number of
> > variables, but my script has got as many as the original - it's the same
> > as the original!

> when you run the program you are not giving it any arguments to read.
> argv[0] is the name of your script.  But you are not providing a value for
> user_name to consume
>
> Try this:
>
> lisi at Tux:~/Python/LearnPythonTheHardWay$ python ex14.py Lisi

Thanks to all of you, guys. :-))  So it wasn't the script that was wrong, it 
was the command I was giving. Doh!

It now runs fine as far as I have gone,  so I can now finish typing the rest 
of the script in.  Hopefully without too many stupid mistakes. :-(

Lisi