vicky_24.py

import re
dic = {}
with open ('access_log.txt') as fh:
    lines = fh.readlines()
    for item in lines: 
        time =  re.search(r'\d\d\/\w{3}\/\d{4}\:\d\d', item).group()
        #print time.group()
        #hour = re.search(r'\d\d\:\d\d\s$',item)
        hour = time.split(':')[1]
#        dic[time] = hour
        dic[hour] = dic.get(hour, 0) + 1

#sorteddic = sorted(dic, key = lambda x: len(dic[x]), reverse = True)
print dic
sorteddic = sorted(dic, key = lambda x: dic[x], reverse = True)

for i in sorteddic:
    print dic[i]