from troposphere.autoscaling import Tags as upstreamTags


# class Tags(upstreamTags):
#     """ extended upstream to prevent tag duplication """
#     def __init__(self, *args, **kwargs):
#         super(Tags, self).__init__(*args, **kwargs)
#         self.tags = self._dedupe(self.tags)

#     def __add__(self, newtags):
#         newtags.tags = self._dedupe(self.tags + newtags.tags)
#         return newtags

#     def _dedupe(self, tags):
#         interim = {}
#         result = []
#         for tag in self.tags + tags:
#             interim[tag['Key']] = tag['Value']
#         for key, val in interim.items():
#             result.append({
#                 'Key': key,
#                 'Value': val
#             })
#         return result

def 

class AutoScalingGroup(AWSObject):
    pass