Python script to list users and groups

Question

I'm attempting to code a script that outputs each user and their group on their own line like so:

user1 group1  
user2 group1  
user3 group2  
...  
user10 group6

etc.

I'm writing up a script in python for this but was wondering how SO might do this. Thanks!

p.s. Take a whack at it in any language but I'd prefer python.

EDIT: I'm working on Linux. Ubuntu 8.10 or CentOS =)

Answer 1

the grp module is your friend. Look at grp.getgrall() to get a list of all groups and their members.

EDIT example:

import grp
groups = grp.getgrall()
for group in groups:
    for user in group[3]:
        print user, group[0]

Answer 2

For *nix, you have the pwd and grp modules. You iterate through pwd.getpwall() to get all users. You look up their group names with grp.getgrgid(gid).

import pwd, grp
for p in pwd.getpwall():
    print p[0], grp.getgrgid(p[3])[0]

Answer 3

sh/bash:

getent passwd | cut -f1 -d: | while read name; do echo -n "$name " ; groups $name ; done

Answer 4

how to show all logged on users?