code: def format_args(self, args):
          '''Format a D-Bus argument tuple into an appropriate logging string.'''
          def format_arg(a):
              if isinstance(a, dbus.Boolean):
                  return str(bool(a))
              if isinstance(a, dbus.Byte):
                  return str(int(a))
              if isinstance(a, int) or isinstance(a, long):
                  return str(a)
              if isinstance(a, str):
                  return '"' + str(a) + '"'
              if isinstance(a, unicode):
                  return '"' + repr(a.encode('UTF-8'))[1:-1] + '"'
              if isinstance(a, list):
                  return '[' + ', '.join([format_arg(x) for x in a]) + ']'
              if isinstance(a, dict):
                  fmta = '{'
                  first = True
                  for k, v in a.items():
                      if first:
                          first = False
                      else:
                          fmta += ', '
                      fmta += format_arg(k) + ': ' + format_arg(v)
                  return fmta + '}'
              return repr(a)
          s = ''
          for a in args:
              if s:
                  s += ' '
              s += format_arg(a)
          if s:
              s = ' ' + s
          return s