code: def is_unique(seq):
      '''Returns True if every item in the seq is unique, False otherwise.'''
      try:
          s = set(seq)
          return len(s) == len(seq)
      except TypeError:
          buf = []
          for item in seq:
              if item in buf:
                  return False
              buf.append(item)
          return Truf is_unique(seq):
      '''Returns True if every item in the seq is unique, False otherwise.'''
      try:
          s = set(seq)
          return len(s) == len(seq)
      except TypeError:
          buf = []
          for item in seq:
              if item in buf:
                  return False
              buf.append(item)
          return True
docs: Returns True if every item in the seq is unique, False otherwise.