newest.py

#!/usr/bin/python

import sys, re

from distutils import version

bucket = {}

package = re.compile(r'([\w_-]+)-([\d\w_\.-]+)\.(noarch|x86_64)')

with open(sys.argv[1]) as f:
    for ln in f:
        pkg = ln.strip()

        if pkg:
            m = package.match(pkg)
            if not m:
                continue

            name, pk_version, arch = m.groups()

            if not "." in pk_version:
                sver = re.match('.*(\d+\.\d+).*', pkg)
                if sver:
                    ver = version.LooseVersion(sver.groups()[0])
            else:
                ver = version.LooseVersion(pk_version)

            if name in bucket:
                bucket[name].append((ver, pkg))
            else:
                bucket[name] = [(ver, pkg)]

keys = bucket.keys()
keys.sort()

for key in keys:
    bucket[key].sort(key=lambda v: v[0])

    print(bucket[key][-1][1])