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

Tim Delaney timothy.c.delaney at gmail.com
Tue Oct 15 21:59:55 CEST 2013

On 16 October 2013 05:17, Alexander Belopolsky < alexander.belopolsky at gmail.com> wrote:

On Tue, Oct 15, 2013 at 12:45 PM, Ethan Furman <ethan at stoneleaf.us> wrote: > with trap(OSError) as cm: > os.unlink('missing.txt') > if cm.exc: > dosomething()

.. and why is this better than try: os.unlink('missing.txt') except OSError as exc: dosomething()

It would allow you to perform a series of operations then process the any exceptions all together e.g.

with trap(OSError) as cm1: os.unlink('missing.txt')

with trap(OSError) as cm2: os.unlink('other_missing.txt')

with trap(OSError) as cm3: os.unlink('another_missing.txt')

for cm in (cm1, cm2, cm3): if cm.exc: do_something(cm.exc)

An equivalent implementation would be:

exceptions = []

try: os.unlink('missing.txt') except OSError as exc: exceptions.append(exc)

try: os.unlink('missing.txt') except OSError as exc: exceptions.append(exc)

try: os.unlink('missing.txt') except OSError as exc: exceptions.append(exc)

for exc in exceptions: if exc: do_something(exc)

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