auto_clean_rpm.py

import os
from collections import defaultdict

LIMIT = 1

file_dict = defaultdict(list)
remove_files = []

for filename in os.listdir('.'):
    start = filename.split('-')[0]
    file_dict[start].append(filename)

for group, filelist in file_dict.iteritems():
    remove_files.extend(sorted(filelist, reverse=True)[LIMIT:])

print "files for remove: {0}".format(", ".join(remove_files))

for remove_file in remove_files:
    os.remove(remove_file)