code: def find(self, query):
          '''Passes the query to the upstream, if it exists'''
          if not self.upstream:
              raise Exception("CompressionCache must have an upstream")
  
          return self.upstream.find(queryf find(self, query):
          '''Passes the query to the upstream, if it exists'''
          if not self.upstream:
              raise Exception("CompressionCache must have an upstream")
  
          return self.upstream.find(query)
docs: Passes the query to the upstream, if it exists