Simple function to choose from a range of options.

choose.py

alphabet = "abcdefghijklmnopqrstuvwxyz"
def choose(question, options):
  assert 1 < len(options) <= len(alphabet)
  while True:
    print(question)
    for i, opt in enumerate(options):
      print("{}) {}".format(alphabet[i], opt))
      
    inp = input("(a-{})> ".format(alphabet[i]))
    if len(inp) == 1:
      index = alphabet.find(inp)
      if -1 < index < len(options):
        print("")
        return index
      
    print("Invalid input.\n")