code:

#!/usr/bin/env python3

import random

flat_notes  = ['A','Bb','B','C','Db','D','Eb','E','F','Gb','G','Ab']
sharp_notes = ['A','A#','B','C','C#','D','D#','E','F','F#','G','G#']
intervals   = ['P1','m2','M2','m3','M3','P4','TT','P5','m6','M6','m7','M7']

def get_interval(note_1, note_2):
  try:
    note_1_index = flat_notes.index(note_1)
  except ValueError:
    note_1_index = sharp_notes.index(note_1)
  try:
    note_2_index = flat_notes.index(note_2)
  except ValueError:
    note_2_index = sharp_notes.index(note_2)
  return intervals[note_1_index - note_2_index]

def get_note(note, interval):
  try:
    note_index = flat_notes.index(note)
    return flat_notes[(note_index + intervals.index(interval)) % 12]
  except ValueError:
    note_index = sharp_notes.index(note)
    return sharp_notes[(note_index + intervals.index(interval)) % 12]

def guess_the_interval_from_the_notes():
  print "I'm going to ask you to identify the interval between two musical notes.  Pick one of:"
  print intervals
  print "If you don't know, say '?' to get the answer.  Say Ctrl-C to quit."
  print ""
  while True:
    choice_1 = random.choice(flat_notes)
    choice_2 = random.choice(flat_notes)
    correct_answers = [get_interval(choice_1, choice_2), get_interval(choice_2, choice_1)]
    user_guess = 'user guess goes here'
    while user_guess not in correct_answers and user_guess != '?' :
      user_guess = raw_input("Whats the interval between %s and %s?  " % ( choice_1, choice_2 ))
    if user_guess not in correct_answers:
      print "Give up?  Correct answers: %s or %s." % (correct_answers[0], correct_answers[1])
    else:
      print "Correct!  You could have either said %s or %s." % (correct_answers[0], correct_answers[1])
    print ""

def guess_the_note_from_the_interval():
  print "I'm going to give you a note and an inverval, and you tell me what note that interval leads to."
  print "If you don't know, say '?' to get the answer.  Say Ctrl-C to quit."
  print ""
  while True:
    random_note = random.choice(flat_notes)
    random_interval = random.choice(intervals)
    correct_answer = get_note(random_note, random_interval)
    correct_answers = [correct_answer, sharp_notes[flat_notes.index(correct_answer)]]
    user_guess = 'user guess goes here'
    while user_guess not in correct_answers and user_guess != '?' :
      user_guess = raw_input("Whats the %s of %s?  " % ( random_interval, random_note ))
    if user_guess not in correct_answers:
      print "Give up?  Correct answers: %s or %s" % (correct_answers[0], correct_answers[1])
    else:
      print "Correct!  You could have either said %s or %s." % (correct_answers[0], correct_answers[1])
    print ""

## uncomment whichever quiz you wanna do
#guess_the_interval_from_the_notes()
guess_the_note_from_the_interval()