#!/usr/bin/python
#
#
# this example is not usefull to find out about updated, upgradable packages
# use the depcache.py example for it (because a pkgPolicy is not used here)
#

import apt_pkg
apt_pkg.init()

cache = apt_pkg.Cache()
packages = cache.Packages

uninstalled, updated, upgradable = {}, {}, {}

for package in packages:
    versions = package.VersionList
    if not versions:
        continue
    version = versions[0]
    for other_version in versions:
        if apt_pkg.VersionCompare(version.VerStr, other_version.VerStr)<0:
            version = other_version
    if package.CurrentVer:
        current = package.CurrentVer
        if apt_pkg.VersionCompare(current.VerStr, version.VerStr)<0:
            upgradable[package.Name] = version
            break
        else:
            updated[package.Name] = current
    else:
        uninstalled[package.Name] = version


for l in (uninstalled, updated, upgradable):
    print l.items()[0]