On 09/07/2016 06:13 PM, Nick Coghlan wrote:
On 7 September 2016 at 19:30, Tomas Orsava <tors...@redhat.com> wrote:
On 09/06/2016 08:25 PM, Nick Coghlan wrote:
Very interesting, although I see a pragmatic problem with trying to
check for explicitly missing packages only after checking for the
standard library ones: the default import system doesn't make a clear
distinction as to which sys.path entries refer to the standard library
and which refer to other directories (like site-packages), so you
can't readily intercept processing after the standard library is
checked but before the rest of sys.path is processed.
I have created a proposal for the Reference Implementation which you can
find here:
https://github.com/torsava/cpython/pull/1
It works by checking for the .missing.py files in every directory on the
sys.path. Therefore the packager can put it into any directory they use for
stdlib, and it will work (that directory of course already is on the
sys.path). And because it checks for the .missing.py file only after it
tried every other possible file extension in each directory, it won't shadow
actually installed stdlib modules.
Oh, nice, that's very cool, and way simpler than anything I was thinking of :)
Cheers,
Nick.
Credit goes to Petr Viktorin, the author of the idea!
Tomas
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