def METHOD_NAME(ob_type, pickle_function, constructor_ob=None):
    if type(ob_type) is _ClassType:
        raise TypeError("copy_reg is not intended for use with classes")
    if not hasattr(pickle_function, '__call__'):
        raise TypeError("reduction functions must be callable")
    dispatch_table[ob_type] = pickle_function
    # The constructor_ob function is a vestige of safe for unpickling.
    # There is no reason for the caller to pass it anymore.
    if constructor_ob is not None:
        constructor(constructor_ob)