code: def represent_as_string(iterable):
      
      keep = (".", "[", "]")
      return "".join(tuple(int_to_str_digit(i) if i not in keep
                     else i for i in iterable))
docs: Represent a number in the form of a string.
      (8, 6, 8, '.', 0, 15) -> "868.0F"
  
      Args:
          iterable - Number represented as an iterable container of digits.
      Returns:
          Number represented as a string of digits.
  
      >>> represent_as_string((8, 6, 8, '.', 0, 15))
      '868.0F'