def get_unsupported_upper_protocol():
 if (Version(CASSANDRA_VERSION) >= Version('2.2')):
  return None
 if (Version(CASSANDRA_VERSION) >= Version('2.1')):
  return 4
 elif (Version(CASSANDRA_VERSION) >= Version('2.0')):
  return 3
 else:
  return None

def get_unsupported_upper_protocol ( ) : if ( Version ( CASSANDRA_VERSION ) >= Version ( '2.2' ) ) : return None if ( Version ( CASSANDRA_VERSION ) >= Version ( '2.1' ) ) : return 4 elif ( Version ( CASSANDRA_VERSION ) >= Version ( '2.0' ) ) : return 3 else : return None
this is used to determine the highest protocol version that is not supported by the version of c* running .