[Python-ideas] import fallback syntax
chris at simplistix.co.uk
Thu Mar 8 19:14:36 CET 2012
On 08/03/2012 10:03, Guido van Rossum wrote:
> We used to have a lot more of these. The agreed-upon solution is to
> have this hidden inside (for instance) the decimal module. E.g. if you
> import heapq, you get heapq.py which attempts to import _heapq but
> gives you the Python implementation if that fails.
Okay, but I'm thinking about the situation where there are genuinely
several possible import sources, with no clear order of fallbacks and
where not all of the packages know about each other. The ElementTree
example is currently a good one...
This seems particularly relevant with things like argparse, unittest2,
I suspect it'll also be relevant where code uses libraries where the
author has chosen to have differently named packages for Python 2 and 3.
It would also be extremely relevant if any of the misguided "provisional
packages in stdlib" PEPs make it through...
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