def filter(self, userinfo, user_info_claims=None):
        """
        Return only those claims that are asked for.
        It's a best effort task; if essential claims are not present
        no error is flagged.

        :param userinfo: A dictionary containing the available user info.
        :param user_info_claims: A dictionary specifying the asked for claims
        :return: A dictionary of filtered claims.
        """

        if user_info_claims is None:
            return copy.copy(userinfo)
        else:
            result = {}
            missing = []
            optional = []
            for key, restr in user_info_claims.items():
                try:
                    result[key] = userinfo[key]
                except __HOLE__:
                    if restr == {"essential": True}:
                        missing.append(key)
                    else:
                        optional.append(key)
            return result
dataset/ETHPy150Open rohe/pyoidc/src/oic/utils/userinfo/__init__.py/UserInfo.filter