Strange output

[bowlofred]

At line 7 your group is parsed into g as a list of strings such as ['users', 'x', '100', 'kintaro,john,autossh,test']

Line 8 is

            for ul in g[3]:                 #ul is userline

This sets ul to the elements of g[3] one at a time. Since g[3] is a string, it sets ul to each of the characters. You want to split g[3], not loop on it.