code: def _format_token(self, dt, token, locale):
          
          if token in self._DATE_FORMATS:
              fmt = locale.get("custom.date_formats.{}".format(token))
              if fmt is None:
                  fmt = self._DEFAULT_DATE_FORMATS[token]
  
              return self.format(dt, fmt, locale)
  
          if token in self._LOCALIZABLE_TOKENS:
              return self._format_localizable_token(dt, token, locale)
  
          if token in self._TOKENS_RULES:
              return self._TOKENS_RULES[token](dt)
  
          # Timezone
          if token in ["ZZ", "Z"]:
              if dt.tzinfo is None:
                  return ""
  
              separator = ":" if token == "Z" else ""
              offset = dt.utcoffset() or datetime.timedelta()
              minutes = offset.total_seconds() / 60
  
              if minutes >= 0:
                  sign = "+"
              else:
                  sign = "-"
  
              hour, minute = divmod(abs(int(minutes)), 60)
  
              return "{}{:02d}{}{:02d}".format(sign, hour, separator, minute)
docs: Formats a DateTime instance with a given token and locale.
  
          :param dt: The instance to format
          :type dt: pendulum.DateTime
  
          :param token: The token to use
          :type token: str
  
          :param locale: The locale to use
          :type locale: Locale
  
          :rtype: str