Python单元测试：测试失败时自动运行调试器

import unittestimport sysimport pdbimport functoolsimport tracebackdef debug_on(*exceptions):    if not exceptions:        exceptions = (AssertionError, )    def decorator(f):        @functools.wraps(f)        def wrapper(*args, **kwargs): try:     return f(*args, **kwargs) except exceptions:     info = sys.exc_info()     traceback.print_exception(*info)      pdb.post_mortem(info[2])        return wrapper    return decoratorclass tests(unittest.TestCase):    @debug_on()    def test_trigger_pdb(self):        assert 1 == 0

我更正了在异常而不是set_trace上调用post_mortem的代码。