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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Mon, 26 Mar 2012 10:48:01 -0600
Subject: Re: random number
To: Michael Poeltl <michael.poeltl@univie.ac.at>
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Cc: python-list@python.org, Nikhil Verma <varma.nikhil22@gmail.com>
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On Mon, Mar 26, 2012 at 3:24 AM, Michael Poeltl
<michael.poeltl@univie.ac.at> wrote:
>>>> import random, string
>>>> def random_number(id):
> ... =A0 =A0 characters =3D list(string.ascii_lowercase +
> ... =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 string.ascii_uppercase +
> ... =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 string.digits)
> ... =A0 =A0 coll_rand =3D []
> ... =A0 =A0 for i in range(6):
> ... =A0 =A0 =A0 =A0 random.shuffle(characters)
> ... =A0 =A0 =A0 =A0 coll_rand.append(characters[0])
> ... =A0 =A0 return ''.join(coll_rand)

You don't need to do all that list manipulation.  This is probably quicker:

def random_number():  # Unused "id" parameter omitted
    characters =3D (string.ascii_lowercase +
                  string.ascii_uppercase +
                  string.digits)
    return ''.join(random.choice(characters) for i in range(6))

Cheers,
Ian