find_cities.py

import requests 


def get_city(ipaddr):
    url = "https://www.ipinfo.io/" + str(ipaddr) 
    response = requests.get(url=url).json()
    return response['city']

lines = open('log.txt').readlines()
cities = {}
ipaddresses = []
for line in lines:
    ipaddresses.append(line.split()[3].split(':')[0])

ipaddresses = list(set(ipaddresses))
for ipaddr in ipaddresses:
    city = get_city(ipaddr)
    if (city in cities):
        cities[city] += 1
    else:
        cities[city] = 1

print cities

    

output.py

{u'Ulsoor': 1, u'Hyderabad': 2, u'Chennai': 1, u'Ludhiana': 1, u'Lucknow': 1, u'New Delhi': 2, u'Mallesvaram': 1, u'Delhi': 2, u'Yelachenahalli': 1, u'Sulthan Bathery': 1, u'Kachiguda': 4, u'Raichur': 1, u'Bengaluru': 35, u'Sampla': 1, u'Bangalore': 1, u'Ahmedabad': 1, u'Mangalore': 2}