Python 3.9 asyncio: Task cancel() throws asyncio.exceptions.CancelledError instead of asyncio.CancelledError

[Clint Olsen]

On Friday, March 31, 2023 at 4:14:51 PM UTC-7, Chris Angelico wrote:
> Okay, so that deals with the part from the subject line, leaving a 
> slightly different problem: The caught exception is not of the same 
> type as you were expecting. First question: Can you reproduce the 
> issue on command? If so, I would recommend trying this: 
> 
> except BaseException as e: 
> print("Got an exception!", type(e)) 
> print(id(type(e))) 
> print(id(asyncio.CancelledError) 
> except: 
> print("Weird things are happening") 
> import sys 
> print(sys.exc_info()) 
> print(id(sys.exc_info()[0])) 
> print(id(asyncio.CancelledError)) 
> 
> Basically, I want to know whether (a) BaseException has changed, which 
> would be a nightmare; and (b) whether asyncio.CancelledError has 
> changed. 
> 
> This is the kind of bizarre behaviour that can happen if a module is 
> reloaded, or if there are multiple versions loaded for some reason. 
> But if that ISN'T what's happening, there'll have to be some other 
> explanation. 

Here's what I see:

Got an exception! <class 'asyncio.exceptions.CancelledError'>
8204064
8204064

Thanks,

-Clint