[Python-ideas] [Python-Dev] Python needs a standard asynchronous return object (original) (raw)

Jesse Noller jnoller at gmail.com
Tue Sep 21 15:25:13 CEST 2010

On Tue, Sep 21, 2010 at 1:39 AM, Andrew Bennetts <andrew at bemusement.org> wrote:

Guido van Rossum wrote: [...]

Unless you want to propose to include Twisted into the stdlib, this is not going to be ready for inclusion into Python 3.2. I don't think anyone has suggested "include Twisted".  What is being suggested is "include twisted.internet.defer, or something about as useful." Let's consider just how hard it would be to just adding twisted/internet/defer.py to the stdlib (possibly as 'deferred.py').  It's already almost a standalone module, especially if pared back to just the Deferred class and maybe one or two of the most useful helpers (e.g. gatherResults, to take a list of Deferreds and turn them into a single Deferred that fires when they have all fired). The two most problematic dependencies would be:  1) twisted.python.log, which for these purposes could be replaced with a call  to a user-replaceable hook whenever an unhandled error occurs (similiar to  sys.excepthook).  2) twisted.python.failure... this one is harder.  As glyph said, it provides  "an object that represent[s] an exception as raised at a particular point,  associated with a particular stack".  But also, as he said, it's a mess and  could use a clean up.  Cleaning it up or thinking of a simpler replacement  is not insurmountable, but probably too ambitious for Python 3.2's schedule. My point is that adding the Deferred abstraction to the stdlib is a much smaller and more reasonable proposition than "include Twisted." -Andrew.

No on was seriously proposing including twisted wholesale. There has been discussion, off and on for years about doing including a stripped down deferred object; and yet no one has stepped up to do it, so it might be hilariously easy, it might be a 40 line module, but it doesn't matter if no one steps up to do the pep, and commit the code, and commit to maintaining it.

jesse

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