code: def write_char_delay(self, ctl, delay):
          
          for i, fmt in enumerate(self.fmt):
              if '{text' in fmt:
                  # The text will use a write delay.
                  ctl.text(fmt.format(text=self.text))
                  if i != (self.fmt_len - 1):
                      ctl.text(self.join_str)
                  ctl.write(
                      file=self.file,
                      delay=delay
                  )
              else:
                  # Anything else is written with no delay.
                  ctl.text(fmt.format(
                      frame=self.frames[self.current_frame],
                      elapsed=self.elapsed
                  ))
                  if i != (self.fmt_len - 1):
                      # Add the join_str to pieces, except the last piece.
                      ctl.text(self.join_str)
                  ctl.write(file=self.file)
          return ctl
docs: Write the formatted format pieces in order, applying a delay
              between characters for the text only.