Campaign contribution finder (See related posts)

import os

## Move into the directory where the database is.
os.chdir('DIRECTORYNAME')

open_file = open('FILENAME.txt', 'r')

lines = 0
person_end = 0
city_end = 0
state_end = 0
amount_end = 0
cityDict = {}

user_info = raw_input('Type a name, city or address. Partial words are ok.\n')


### Find the number of donors in a city
def find_city_number():
    for line in open_file:
        if line.find(user_info) >=1:
            if cityDict.has_key(user_info):
                cityDict[user_info] += 1
            else:
                cityDict[user_info] = 1

### Get the list of donations from city. Definitions break the line out by field.
def find_city_list():
    open_file = open('FILENAME.txt', 'r')
    for line in open_file:
        person_end = (line.find(','))
        person_name = line[:person_end]
        city_end = (line.find(',', person_end + 1))
        city_name = line[(person_end + 1):city_end]
        state_end = (line.find(',', city_end + 1))
        state_name = line[(city_end + 1):state_end]
        amount_end = (line.find(',', state_end + 1))
        amount = line[(state_end + 1):amount_end]
        if line.find(user_info) >= 1:
            print person_name + ';', city_name + ',', state_name + ';', '$' + amount

## Run the program, taking one city name and giving the count and list
find_city_number()
if cityDict == {}:
    print 'No donors found.'
else:
    print cityDict
    find_city_list()