test_traceback.py 文件源码

def test_base_exception(self):
        # Test that exceptions derived from BaseException are formatted right
        e = KeyboardInterrupt()
        lst = traceback.format_exception_only(e.__class__, e)
        self.assertEqual(lst, ['KeyboardInterrupt\n'])

    # String exceptions are deprecated, but legal.  The quirky form with
    # separate "type" and "value" tends to break things, because
    #     not isinstance(value, type)
    # and a string cannot be the first argument to issubclass.
    #
    # Note that sys.last_type and sys.last_value do not get set if an
    # exception is caught, so we sort of cheat and just emulate them.
    #
    # test_string_exception1 is equivalent to
    #
    # >>> raise "String Exception"
    #
    # test_string_exception2 is equivalent to
    #
    # >>> raise "String Exception", "String Value"
    #