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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_filter(self, name=constants.STRING_FILTER):
 """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 """

        try:
            filter_key = c_uamqp.symbol_value(name)
            return self._address.filter_set[filter_key].value
        except (TypeError, KeyError):
            return None