Example program that uses a dictionary object and reads and writes to a binary file.

binaryReadWrite.py

import pickle #used to serialize the data
import os.path
#Comment this code
#global variables
songs_and_bands = {"Drive": "Judge Jackson"}

def open_file():
    global songs_and_bands #get global variable
    if os.path.isfile('songs_and_bands.dat'):
        binary_file=open('songs_and_bands.dat','rb')
        songs_and_bands=pickle.load(binary_file)
        binary_file.close()

def close_file():
    global songs_and_bands #get global variable
    binary_file=open('songs_and_bands.dat','wb')
    pickle._dump(songs_and_bands, binary_file)
    binary_file.close()
def list_bands():
    global songs_and_bands
    for keys in sorted(songs_and_bands.keys()):
        print(keys,songs_and_bands[keys])
def find_a_song():
    global songs_and_bands
    s = input("What song are you trying to find?\n ")
    if s in songs_and_bands:
        print(s,songs_and_bands[s])
    else:
        print("Sorry, couldn't find the song.")
def delete_a_song():
    global songs_and_bands
    s = input("What song do you want to delete?\n ")
    if s in songs_and_bands:
        del songs_and_bands[s]
def add_a_song():
    global songs_and_bands
    song = input("Enter a song: ")
    band = input("Enter a band: ")
    songs_and_bands[song] = band
def main():
    open_file()
    user_input = input("Enter a choice: "
                       "1 - list bands "
                       "2 - Find a song "
                       "3 - Delete a song "
                       "4 - Add a song "
                       "5 - Exit \n")
    while user_input != "5":
        if user_input == "1":
            list_bands()
        elif user_input == "2":
            find_a_song()
        elif user_input == "3":
            delete_a_song()
        elif user_input == "4":
            add_a_song()
        elif user_input == "5":
            break
        else:
            print("Choice needs to be 1-5")
        user_input = input("Enter a choice: "
                       "1 - list bands "
                       "2 - Find a song "
                       "3 - Delete a song "
                       "4 - Add a song "
                       "5 - Exit \n")
    close_file()
main()