def add_tag(self, tag):
        """
            Adds a tag to the list of tags and makes sure the result list contains only unique results.
        """
        self.tags = list(set(self.tags or []) | set([tag]))
def add_tag(self, tag):
        """
            Adds a tag to the list of tags and makes sure the result list contains only unique results.
        """
        self.tags = list(set(self.tags or []) | set([tag]))
def add_tag ( self , tag ) : self . tags = list ( set ( self . tags or [ ] ) | set ( [ tag ] ) )
Adds a tag to the list of tags and makes sure the result list contains only unique results.
Adds a tag to the list of tags and makes sure the result list contains only unique results .