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For example the problem appears when I'm using Tornado web-server with enabled asyncio debugging mode exception thrown in a coroutine causes another one:
Traceback (most recent call last):
File ".../lib/python3.5/site-packages/tornado/web.py", line 1445, in _execute
result = yield result
File ".../lib/python3.5/site-packages/tornado/gen.py", line 1008, in run
value = future.result()
File ".../lib/python3.5/site-packages/tornado/concurrent.py", line 232, in result
raise_exc_info(self._exc_info)
File "<string>", line 3, in raise_exc_info
File ".../lib/python3.5/site-packages/tornado/gen.py", line 1014, in run
yielded = self.gen.throw(*exc_info)
File "<string>", line 6, in _wrap_awaitable
TypeError: throw() takes 2 positional arguments but 4 were given
Hello!
When
PYTHONASYNCIODEBUGis set asyncio wraps each coroutine in specialCoroWrapperclass which has incorrect signature forthrowmethod:However it should be:
For example the problem appears when I'm using Tornado web-server with enabled asyncio debugging mode exception thrown in a coroutine causes another one:
See tornado's code here.