[Python-Dev] Another PEP 343 contextmanager glitch

[Phillip J. Eby]

At 08:13 PM 3/24/2006 -0800, Guido van Rossum wrote:
>I think that the code you added:
>
>+            except:
>+                if sys.exc_info()[1] is not value:
>+                    raise
>
>could use a comment explaining what's going on;

Done.


>  the difference between
>returning None and re-raising the exception is really quite subtle
>here, and only ever matters if something else besides the
>with-statement framework is calling __exit__. (I would add this
>distinction to the PEP too.)

Also done.


>I'd like to see some discussion of your proposed change to .pth file
>processing; this could cause some surprises and will slow down all
>Python's start-up time due to the necessity to list every directory on
>sys.path. This is IMO a bad thing; there must be nothing to keep
>people from writing tiny scripts in Python, and slow startup time is
>an inhibitor there.

Okay, I'll cross that off then.  Setuptools will just have to keep using 
its "install a special site.py on PYTHONPATH" trick to support PYTHONPATH 
installs.


>  (If you don't believe this could be a problem, try
>it with a long path containing several directories on NFS. This is the
>standard setup of Google developer workstations, and it gives one a
>different outlook on life.)

Ouch.  All that computing power and you can't even copy files to your own 
machines?  Tsk, tsk.  ;)