def read_file(file):
    '''
    file, a file object
    Starting from the first line, it reads every 2 lines
    and stores them in a tuple.
    Starting from the second line, it reads every 2 lines
    and stores them in a tuple.
    Returns a tuple of the two tuples.
    '''
    first_every_2 = ()
    second_every_2 = ()
    line_count = 1
    for line in file:
        stripped_line = line.replace('\n', '')
        if line_count%2 == 1:
            first_every_2 += (stripped_line, )
        elif line_count % 2 == 0:
            second_every_2 += (stripped_line, )
        line_count += 1
    return (first_every_2, second_every_2)

def sanitize(some_tuple):
    '''
    phones, a tuple of strings
    Removes all spaces, dashes, and open/closed parentheses
    in each string
    Returns a tuple with cleaned up string elements
    '''
    clean_string = ()
    for st in some_tuple:
        st = st.replace(' ', '')
        st = st.replace('-', '')
        st = st.replace('(', '')
        st = st.replace(')', '')
        clean_string += (st, )
    return clean_string

def analyze_friends(names, phones, all_areacodes, all_places):
    '''
    names, a tuple of friend names
    phones, a tuple of phone numbers without special symbols
    all_areacodes, a tuple of strings for the area codes
    all_places, a tuple of strings for the US states
    Prints out how many friends you have and every unique
    state that is represented by their phone numbers.
    '''

    def get_unique_area_codes():
        '''
        Returns a tuple of all unique area codes in phones
        '''
        area_codes = ()
        for ph in phones:
            if ph[0:3] not in area_codes:
                area_codes += (ph[0:3], )
        return area_codes
 
    def get_states(some_areacodes):
        '''
        some_area_codes, a tuple of area codes
        Returns a tuple of the states associated with those area codes
        '''
        states = ()
        for ac in some_areacodes:
            if ac not in all_areacodes:
                states += ('BAD AREACODE', )
            else:
                index = all_areacodes.index(ac)
                states += (all_places[index], )
        return states
 
    num_friends = len(names)
    unique_area_codes = get_unique_area_codes()
    unique_states = get_states(unique_area_codes)
    print('You have', num_friends, 'friends!')
    print('They live in', unique_states)

friends_file = open('friends.txt')
(names, phones) = read_file(friends_file)
areacodes_file = open('map_areacodes_states.txt')
(areacodes, states) = read_file(areacodes_file)
clean_phones = sanitize(phones)
analyze_friends(names, clean_phones, areacodes, states)
friends_file.close()
areacodes_file.close()