code: def matches_pattern(self, other):
          
          ismatch = False
          if isinstance(other, Userdata):
              for key in self._userdata:
                  if self._userdata[key] is None or other[key] is None:
                      ismatch = True
                  elif self._userdata[key] == other[key]:
                      ismatch = True
                  else:
                      ismatch = False
                      break
          return ismatch
docs: Test if the current instance matches a template instance.