[Tutor] Parsing /etc/passwd

[Gerhardus Geldenhuis]

Fantastic,
Thanks Hugo that makes 100% sense now! Testing both regex for including /
and doing split and when done throwing both away and using the default
module.

Regards

On Wed, Oct 12, 2011 at 2:49 PM, Hugo Arts <hugo.yoshi at gmail.com> wrote:

> On Wed, Oct 12, 2011 at 3:41 PM, Gerhardus Geldenhuis
> <gerhardus.geldenhuis at gmail.com> wrote:
> > Hi
> > I wrote the following code:
> >   f = open('/etc/passwd', 'r')
> >   users = f.read()
> >   userelements = re.findall(r'(\w+):(\w+):(\w+):(\w+):(\w+):(\w+):(\w+)',
> > users)
> >   print userelements
> >   for user in userelements:
> >     (username, encrypwd, uid, gid, gecos, homedir, usershell) = user  #
> > unpack the tuple into 7 vars
> >     print username
> >
> > but I get no results so my parsing must be wrong but I am not sure why.
> > Incidentally while googling I found the
> > module http://docs.python.org/library/pwd.html which I will eventually
> use
> > but I am first curious to fix and understand the problem before I throw
> away
> > this code.
> > Regards
> >
>
> the homedir and usershell parts are paths. Paths will contain slashes.
> The \w character class captures only [A-Za-z0-9_],  that is, letters,
> numbers, and the underscore. That means slashes will not match, and so
> the entire match fails.
>
> On another note, the structure of the /etc/passwd file is pretty
> simple, I don't think you need regexes. Simply use split:
>
> users = f.readlines()
> for user in users:
>    (username, encrypwd, uid, gid, gecos, homedir, usershell) =
> user.split(':')
>
> HTH,
> Hugo
>



-- 
Gerhardus Geldenhuis
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