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

Ethan Furman ethan at stoneleaf.us
Wed Oct 16 00:41:33 CEST 2013

On 10/15/2013 12:59 PM, Tim Delaney wrote:

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

On Tue, Oct 15, 2013 at 12:45 PM, Ethan Furman <ethan at stoneleaf.us <mailto: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('othermissing.txt') with trap(OSError) as cm3: os.unlink('anothermissing.txt') for cm in (cm1, cm2, cm3): if cm.exc: dosomething(cm.exc)

As long as we're having fun ;)

 trap_os = suppress(OSError)
 dead_files = ('missing.txt', 'other_missing.txt', 'actually_here.txt')

 for file in dead_files:
     with trap_os:
         os.unlink(missing.txt)

 for exc in trap_os.suppressed_exceptions:
     do_something(exc)

-- Ethan

More information about the Python-Dev mailing list