def find(self, source, issuer):
        """
        Find a key bundle
        :param source: A url
        :param issuer: The issuer of keys
        """
        try:
            for kb in self.issuer_keys[issuer]:
                if kb.source == source:
                    return kb
        except __HOLE__:
            return None
dataset/ETHPy150Open rohe/pyoidc/src/oic/utils/keyio.py/KeyJar.find