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Re: How come StopIteration.__base__ is not BaseException?

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On 8/27/2013 3:52 PM, Marco Buttu wrote:
> On 08/27/2013 08:51 PM, Terry Reedy wrote:
>
>> BaseException was added just so it would be possible to catch nearly
>> everything but a few exceptions. The first two were KeyboardInterrupt
>> and SystemExit (in 2.5). GeneratorExit was switched in 2.6, but I forget
>> the details of why.
>
> Maybe in order to don't catch it inside a generator using a except
> Exception clause, because it is used to notify an active generator is
> closed:
>
>  >>> def foogen():
> ...     for i in range(10):
> ...         try:
> ...             yield i
> ...         except:
> ...             print('Catched!')
> ...             # raise
> ...
>  >>> g = foogen()
>  >>> next(g)
> 0
>  >>> g.close()
> Catched!
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> RuntimeError: generator ignored GeneratorExit
>
> Do you remember if this is the reason? Thanks,

I only remember that there was a 'problem' that necessitated a change in 
2.6 after the introduction in 2.5. The above seems reasonable.

-- 
Terry Jan Reedy

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How come StopIteration.__base__ is not BaseException? Marco Buttu <marco.buttu@gmail.com> - 2013-08-26 21:37 +0200
  Re: How come StopIteration.__base__ is not BaseException? random832@fastmail.us - 2013-08-26 16:10 -0400
    Re: How come StopIteration.__base__ is not BaseException? Marco Buttu <marco.buttu@gmail.com> - 2013-08-27 08:17 +0200
      Re: How come StopIteration.__base__ is not BaseException? Marco Buttu <marco.buttu@gmail.com> - 2013-08-27 08:18 +0200
      Re: How come StopIteration.__base__ is not BaseException? Steven D'Aprano <steve@pearwood.info> - 2013-08-27 09:22 +0000
        Re: How come StopIteration.__base__ is not BaseException? Marco Buttu <marco.buttu@gmail.com> - 2013-08-27 12:02 +0200
          Re: How come StopIteration.__base__ is not BaseException? Terry Reedy <tjreedy@udel.edu> - 2013-08-27 14:51 -0400
            Re: How come StopIteration.__base__ is not BaseException? Marco Buttu <marco.buttu@gmail.com> - 2013-08-27 21:52 +0200
              Re: How come StopIteration.__base__ is not BaseException? Terry Reedy <tjreedy@udel.edu> - 2013-08-27 16:37 -0400
  Re: How come StopIteration.__base__ is not BaseException? Ethan Furman <ethan@stoneleaf.us> - 2013-08-27 13:00 -0700

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