code: def input(message, until, single_char=False, transform=lambda a: a):
      
      def _getch(message):
          print(message, end='')
          return getch()
  
      while True:
          text = transform(line_input(message) if not single_char else _getch(message))
          if until(text):
              return text
docs: Keeps asking for input (each time in a new line) until a condition
          over the input text evaluates to true. Returns the input. This
          input can be done using text input or character input.