[Python-Dev] PEP 408 -- Standard library preview package (original) (raw)

Michael Foord fuzzyman at voidspace.org.uk
Sat Jan 28 17:12:47 CET 2012

On 28/01/2012 04:44, Stephen J. Turnbull wrote:

Michael Foord writes:

> >> Assuming the module is then promoted to the the standard library proper in > >> release 3.X+1, it will be moved to a permanent location in the library:: > >> > >> import example > >> > >> And importing it from _preview_ will no longer work. > > Why not leave it accessible through preview too? > > +1 Er, doesn't this contradict your point about using try: from preview import spam except ImportError: import spam ? I think it's a bad idea to introduce a feature that's supposed to break (in the sense of "make a break", ie, change the normal pattern) with every release and then try to avoid breaking (in the sense of "causing an unexpected failure") code written by people who don't want to follow the discipline of keeping up with changing APIs. If they want that stability, they should wait for the stable release. Modules should become unavailable from preview as soon as they have a stable home. I like not breaking people's code where possible.

Michael

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