from pymongo import MongoClient

listState=[]
listZip=[]
listStateZip=[]
listCity=[]
listCityStateZip=[]

#Assume we have successfully connected to the database
for a in listState:
listZip = db.listings.distinct('address.zip', {'address.state': a})
for b in listZip:
    tempA = {}
    tempA['state'] = a
    tempA['zip'] = b
    listStateZip.append(tempA)

for a in listStateZip:
    listCity = db.listings.distinct('address.city',{'address.zip':a['zip']})
    for b in listCity:
        tempB = {}
        tempB['city'] = b
        tempB['state'] = a['state']
        tempB['zip'] = a['zip']
        tempB['cityStateZip'] = b + ', ' + a['state'] + ' ' + a['zip']
        listCityStateZip.append(tempB)