[Python-Dev] PEP 549 vs. PEP 562 (original) (raw)
Guido van Rossum guido at python.org
Mon Nov 13 19:23:03 EST 2017
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I've pondered two PEPs that are in (friendly) competition with each other:
- PEP 549 -- Instance Descriptors (Larry Hastings)
- PEP 562 -- Module getattr (Ivan Levkivskyi)
In the end I am rejecting PEP 549 and I hope to accept PEP 562, with a small addition to the latter to also support overriding dir (so that one can provide a dir implementation that matches the getattr implementation, or perhaps counteracts it, in case one wants deprecated attributes to be omitted from dir() but still usable).
The dir addition is mentioned here: https://github.com/ilevkivskyi/cpython/pull/3#issuecomment-343591293 .
A bit more motivation for my choice: re-reading PEP 549 reminded me of how its implementation is remarkably subtle (invoking Armin Rigo; for more details read https://www.python.org/dev/peps/pep-0549/#implementation). On the contrary, the implementation of PEP 562 is much simpler. With the Zen of Python in mind, this gives a hint that it is the better idea, and possibly even a good idea.
Ivan, once you've added the dir thing to your PEP, please post it to python-dev to solicit review from its (larger) readership.
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