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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_alert(self, value):
 """Overwrite the default get_alert method. :returns: string -- Signal alert """

        ret = 'OK'
        try:
            if value <= self.get_limit('critical', stat_name=self.plugin_name):
                ret = 'CRITICAL'
            elif value <= self.get_limit('warning', stat_name=self.plugin_name):
                ret = 'WARNING'
            elif value <= self.get_limit('careful', stat_name=self.plugin_name):
                ret = 'CAREFUL'
        except (TypeError, KeyError) as e:
            # Catch TypeError for issue1373
            ret = 'DEFAULT'

        return ret