code: def _is_punctuation(self, char):
          
          cp = ord(char)
          # We treat all non-letter/number ASCII as punctuation.
          # Characters such as "^", "$", and "`" are not in the Unicode
          # Punctuation class but we treat them as punctuation anyways, for
          # consistency.
          group0 = cp >= 33 and cp <= 47
          group1 = cp >= 58 and cp <= 64
          group2 = cp >= 91 and cp <= 96
          group3 = cp >= 123 and cp <= 126
          if (group0 or group1 or group2 or group3):
              return True
          cat = unicodedata.category(char)
          if cat.startswith('P'):
              return True
          return False
docs: Checks whether `chars` is a punctuation character.