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

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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?

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


-- 
Steven

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