NNTP.list(group_pattern=None, *, file=None)
Send a LIST or LIST ACTIVE command. Return a pair (response, list) where list is a list of tuples representing all the groups available from this NNTP server, optionally matching the pattern string group_pattern. Each tuple has the form (group, last, first, flag), where group is a group name, last and first are the last and first article numbers, and flag usually takes one of these values:
y: Local postings and articles from peers are allowed.
m: