code: def _check_timezone_max_length_attribute(self):     # pragma: no cover
          
  
          # Retrieve the maximum possible length for the time zone string
          possible_max_length = max(map(len, pytz.all_timezones))
  
          # Make sure that the max_length attribute will handle the longest time
          #   zone string
          if self.max_length < possible_max_length:   # pragma: no cover
              return [
                  checks.Error(
                      msg=(
                          "'max_length' is too short to support all possible "
                          "pytz time zones."
                      ),
                      hint=(
                          "pytz {version}'s longest time zone string has a "
                          "length of {value}, although it is recommended that "
                          "you leave room for longer time zone strings to be "
                          "added in the future.".format(
                              version=pytz.VERSION,
                              value=possible_max_length
                          )
                      ),
                      obj=self,
                  )
              ]
  
          # When no error, return an empty list
          return []
docs: Checks that the `max_length` attribute covers all possible pytz
          timezone lengths.