[Python-Dev] PEP 408 -- Standard library __preview__ package
Steven D'Aprano
steve at pearwood.info
Sat Feb 4 00:18:37 CET 2012
Chris Withers wrote:
> Every time I see things like the following I cry a little inside:
>> try:
> try:
> from py2stdliblocation import FooBar as Foo
> except ImportError:
> from py3stdliblocation import foo as Foo
> except ImportError:
> from pypilocation import Foo
The syntax is inelegant, but the concept is straightforward and simple and not
worth tears.
"I need a thing called Foo, which can be found here, or here, or here. Use the
first one found."
In principle this is not terribly different from the idea of a search PATH
when looking for an executable, except the executable can be found under
different names as well as different locations.
> Now we're talking about having to add __preview__ into that mix too?
As I understand it, Guido nixed that idea. (Or did I imagine that?) Preview
modules will be just added to the std lib as normal, and you have to read the
docs to find out they're preview.
--
Steven
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