[Python-ideas] Use `isinstance` check during exception handling

[Sjoerd Job Postmus]

> On 5 Nov 2015, at 09:05, Serhiy Storchaka <storchaka at gmail.com> wrote:
> 
>> On 05.11.15 00:02, sjoerdjob at sjec.nl wrote:
>> Now, PEP3151 took over a year to be resolved, judging by the dates. If
>> we have to go through changes like this more often, one will have to
>> wait quite a while. Also, consider backwards compatibility issues. Code
>> using FileNotFoundError will only run on Python3.3+.
>> 
>> Thus I propose to have the exception handling code use the normal
>> `isinstance` machinery, as it is more powerful, and allows one to use
>> virtual base classes to check if the instance of the exception is
>> relevant to catch. An example:
>> 
>>     import errno
>> 
>>     # Fake `FileNotFoundError` in Python3.2
> 
> Do you propose to add a new feature in 3.2?

Definitely not! PEP3151 was just meant as an example of an improvement of exception granularity taking a long time.

> 
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