code: def havespace(self, scriptname, scriptsize):
          
          code, data = self.__send_command(
              "HAVESPACE", [scriptname.encode("utf-8"), scriptsize])
          if code == "OK":
              return True
          return False
docs: Ask for available space.
  
          See MANAGESIEVE specifications, section 2.5
  
          :param scriptname: script's name
          :param scriptsize: script's size
          :rtype: boolean