python city lookup

pycitylookup.py

import json
import urllib, urllib2, hashlib

class DataAccessLayer(object):
    def __init__(self):
        self.cache = None
    def __load__(self, file_path):
        path_hash = hashlib.md5(file_path).hexdigest()[:7]
        file_name = '{}.json'.format(path_hash)
        urllib.urlretrieve(file_path, file_name)
        return self.__read__(file_name)
    def __read__(self, file_name):
        with open(file_name) as file_pointer:
            self.cache = json.load(file_pointer)

class CityDAL(DataAccessLayer):
    city_url = 'https://pastebin.com/raw/acHwzmYB'
    def __init__(self): 
        super(CityDAL, self).__init__()
    def find(self, name, state):
        if(not self.cache):
            super(CityDAL, self).__load__(self.city_url)
        for city in self.cache:
            if(city['city'] == name and city['state'] == state):
                return city
        return None
    def each(self, callback):
        if(not self.cache):
            super(CityDAL, self).__load__(self.city_url)
        for city in self.cache:
            callback(city)

class CitySunsetDAL(DataAccessLayer):
    sunset_url = 'https://query.yahooapis.com/v1/public/yql?q=select%20astronomy.sunset%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20text%3D%22{location}%22)&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys'
    def __init__(self):
        super(CitySunsetDAL, self).__init__()
    def find(self, name, state):
        if(not self.cache):
            url = self.sunset_url.format(location=name)
            super(CitySunsetDAL, self).__load__(url)
        if(self.cache['query']['count'] == 1):
            return self.cache['query']['results']['channel']['astronomy']
    def each(self, callback):
        if(not self.cache):
            super(CitySunsetDAL, self).__load__(self.sunset_url)
        for city in self.cache:
            callback(city)

class City():
    def __init__(self, name, state, cities, sunsets):
        self.name = name
        self.state = state
        self.cities = cities
        self.sunsets = sunsets
    def print_info(self):
        city = self.cities.find(self.name, self.state)
        sunset = self.sunsets.find(self.name, self.state)
        if(not city):
            print 'City Not Found'
        else:
            print city
            print sunset
    def print_all(self):
        
if __name__ == '__main__':
    cities = CityDAL()
    sunsets = CitySunsetDAL()
    my_city = City('Boston', 'Massachusetts', cities, sunsets)
    second_city = City('New York', 'New York', cities, sunsets)
    my_city.print_info()
    second_city.print_info()