script to show biggest packages at your rpm-based system

biggest_backages.py

#!/usr/bin/python

# script to show biggest packages at your rpm-based system
# just run it like 'python biggest_packages.py | less'

import subprocess

packages = {}

process = subprocess.Popen(r"rpm -qa --queryformat '%{size}|%{name}-%{version}-%{release}\n'", 
                     shell=True, 
                     stdout=subprocess.PIPE, 
                     stderr=subprocess.STDOUT)

for line in process.stdout:
    data = line.split('|')
    packages[long(data[0])] = data[1]

process.wait()

sorted_sizes = sorted(packages, reverse=True)

si = ["", "K", "M"]
def get_h(s):
    h = s
    for i in range(1, len(si)):
        if (s / pow(1024, i)) == 0:
            break
        else:
            h = "%s%s" % ((s / pow(1024, i)), si[i])
    return h

print "Total packages installed: %s" % len(sorted_sizes)
print "And they are using %s of disk space" % get_h(reduce(lambda a,b: a+b, sorted_sizes, 0L))
print
print "-"*40
print 

for s in sorted_sizes:
    print get_h(s),packages[s],