<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def stage(self, name):
 """ Method for searching specific stage by it's name. :param name: name of the stage to search. :return: found stage or None. :rtype: yagocd.resources.stage.StageInstance """

        for stage in self.stages():
            if stage.data.name == name:
                return stage