Arch Linux: Clean up pacman cache, leave only 2 versions of every package, the rest of olders remove

pacman-cleanup-cache

#!/usr/bin/python
import os
import collections

def getPackageName(fileName):
    exp = fileName.split('-')
    found = False
    name = ""
    sep = ""

    for chunk in exp:
        try:
            float(chunk.replace('.', ''))
            break
        except Exception:
            if not name:
               sep = ""
            else:
               sep = "-"

            name = name + sep + chunk

    return name

packagesCount = {}
maxVersions = 2

for file in os.listdir('/var/cache/pacman/pkg'):
    if not getPackageName(file) in packagesCount:
        packagesCount[getPackageName(file)] = {}
        
    packagesCount[getPackageName(file)][os.path.getmtime('/var/cache/pacman/pkg/'+file)] = '/var/cache/pacman/pkg/'+file

for package in packagesCount:
    sortedDict = reversed(sorted(packagesCount[package].items()))
    i = 0
    
    for item in sortedDict:
        i = i + 1
        
        if i > maxVersions:
            print("rm "+item[1])
            os.system("rm "+item[1])
        

#print(packagesCount)