TypeError: catching classes that do not inherit from BaseException is not allowed

写了一个demo异常类，没有继承BaseException类，提示报如下错误，很明显只要继承一下BaseException就可以了。
TypeError: catching classes that do not inherit from BaseException is not allowed 捕获到一个没有继承BaseException的异常类（这是不被允许的）。

Exception ignored in: <generator object demo_exc_handling at 0x000001D06C66E200>
Traceback (most recent call last):File "a5_3_coroutine_exception.py", line 10, in demo_exc_handling
TypeError: catching classes that do not inherit from BaseException is not allowed

class DemoException():  # DemoException(BaseException) 为正确写法"""demo异常类型"""passdef demo_exc_handling():print('-> coroutine started')while True:try:var = yieldexcept DemoException as e:print('*** DemoException handled. Continuing...')else:print('-> coroutine received: {!r}'.format(var))# raise RuntimeError('This line should never run.')cor_exc = demo_exc_handling()
cor_exc.send(None)
cor_exc.send(1)

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