[Python-Dev] PEP 408 -- Standard library __preview__ package

Steven D'Aprano steve at pearwood.info
Fri Jan 27 21:48:55 CET 2012

Eli Bendersky wrote:

>> try:
>>    from __preview__ import thing
>> except ImportError:
>>    import thing
>> So no need to target a very specific version of Python.
> Yep, this is what I had in mind. And it appeared too trivial to place
> it in the PEP.

Trivial and wrong.

Since thing and __preview__.thing may have subtle, or major, API differences, 
how do you use it?

     result = thing.foo(a, b, c) + thing.bar(x)
except AttributeError:
     # Must be the preview version
     result = thing.foobar(a, c, b, x)


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