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Tue Oct 15 18:45:59 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-October/129607.html

On 10/15/2013 09:28 AM, PJ Eby wrote:
> On Tue, Oct 15, 2013 at 11:52 AM, R. David Murray wrote:
>>
>> What about making the context manager provide the trapped exception,
>> in a fashion similar to what assertRaises does?
>
> Sadly, that won't work, since context managers provide a value
> *before* the block is executed, not after.

However, if the CM provides the value before, and the with block accepts it, it can then have the exception added to it:

     with trap(OSError) as cm:
         os.unlink('missing.txt')
     if cm.exc:
         do_something()

--
~Ethan~

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Showing content from https://mail.python.org/pipermail/python-dev/2013-October/129607.html below:

[Python-Dev] cpython: Rename contextlib.ignored() to contextlib.ignore().