code: def get_filter(self, name=constants.STRING_FILTER):
          
          try:
              filter_key = c_uamqp.symbol_value(name)
              return self._address.filter_set[filter_key].value
          except (TypeError, KeyError):
              return None
docs: Get the filter on the source.
  
          :param name: The name of the filter. This will be encoded as
           an AMQP Symbol. By default this is set to b'apache.org:selector-filter:string'.
          :type name: bytes