[Python-Dev] PEP 408 -- Standard library __preview__ package
Michael Foord
fuzzyman at voidspace.org.uk
Fri Jan 27 16:39:44 CET 2012
On 27/01/2012 15:35, Matt Joiner wrote:
>> A more normal incantation, as is often the way for packages that became
>> parts of the standard library after first being a third party library
>> (sometimes under a different name, e.g. simplejson -> json):
>>>> try:
>> from __preview__ import thing
>> except ImportError:
>> import thing
>>>> So no need to target a very specific version of Python.
> I think this is suboptimal, having to guess where modules are located,
> you end up with this in every module:
>> try:
> import cjson as json
> except ImportError:
> try:
> import simplejson as json
> except ImportError:
> import json as json
It's trivial to wrap in a function though - or do the import in one
place and then import the package from there.
Michael
> Perhaps the versioned import stuff could be implemented (whatever the
> syntax may be), in order that something like this can be done instead:
>> import regex('__preview__')
> import regex('3.4')
>> Where clearly the __preview__ version makes no guarantees about
> interface or implementation whatsoever.
>> etc.
>
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