myidea.py

letters_guessed = 'blah'
secret_word     = 'hello'
output = ''
for a in secret_word:
  if a in letters_guessed:
    output += a
  else:
    output += '_'
    
    
alphabet = 'abcdefghijklmnopqrstuvwxyz'
available_answers = [x for x in alphabet if x not in letters_guessed]
answer = 'q'
if answer.lower() in available_answers:
  letters_guessed += answer
else:
  print('can\'t do that, son')
return str(available_answers)