The grp Module
(Unix only) The grp module provides an interface to the Unix group database (/etc/group). The getgrgid function returns data for a given group identity (see Example 12-4), and getgrnam returns data for a group name.
Example 12-4. Using the grp Module
File: grp-example-1.py import grp import os print grp.getgrgid(os.getgid()) print grp.getgrnam("wheel") ('effbot', '', 4711, ['effbot']) ('wheel', '', 10, ['root', 'effbot', 'gorbot', 'timbot'])
The getgrall function returns a list of database entries for all available groups.
If you're going to do a lot of group queries, you can save some time by using getgrall to copy all the (current) groups into a dictionary. The groupinfo function in Example 12-5 returns the information for either a group identifier (an integer) or a group name (a string).
Example 12-5. Using the grp Module to Cache Group Information
File: grp-example-2.py
import grp
import os
# preload password dictionary
_grp = {}
for info in grp.getgrall():
_grp[info[0]] = _grp[info[2]] = info
def groupinfo(gid):
# name or gid integer
return _grp[gid]
print groupinfo(os.getgid())
print groupinfo("wheel")
('effbot', '', 4711, ['effbot'])
('wheel', '', 10, ['root', 'effbot', 'gorbot', 'timbot'])
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