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

Stephen J. Turnbull turnbull at sk.tsukuba.ac.jp
Sat Jan 28 05:44:52 CET 2012

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.

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