def add_tag(self, key, value=''):
        status = self.connection.create_tags([self.id], {key : value})
        if self.tags is None:
            self.tags = TagSet()
        self.tags[key] = value
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dataset/ETHPy150Open darcyliu/storyboard/boto/ec2/ec2object.py/TaggedEC2Object.add_tag--crossover with--dataset/ETHPy150Open enthought/pyface/pyface/i_splash_screen.py/MSplashScreen.close