[Python-Dev] PEP 447: add type.locallookup (original) (raw)

Ronald Oussoren ronaldoussoren at mac.com
Thu Sep 12 16:33:12 CEST 2013

On 9 Sep, 2013, at 23:18, Mark Shannon <mark at hotpy.org> wrote:

On 09/09/13 15:30, Ethan Furman wrote:

On 07/30/2013 11:17 PM, Ronald Oussoren wrote:

And something I forgot to ask: is anyone willing to be the BDFL-Delegate for PEP 447? Bump. It would be nice if this could make into 3.4. IMO, there are some issues that need to be addressed before PEP 447 should be accepted. 1. Is there even a problem at all, or is this just a bug in super? Why doesn't super() respect the getattribute method of the superclass?

Because getattribute looks in the instance dict before walking the MRO, while super does not.

2. Is this the best way to solve the problem (if there is a problem)? Would a super special method be sufficient and less intrusive.

One reason for the locallookup method is to make normal and super attribute lookup more simular, adding a super special method would lead to code duplication: both getattribute and super would either contain simular code, or would call out to a shared method anyway.

3. Are the proposed semantics OK? I think they are, but very low level changes such as these can have unforeseen consequences. For example, PEP 3135 and issue 12370. 4. What is the performance impact. pybench really doesn't count as a benchmark.

What kind of benchmark would you like to see? BTW. I ran more than pybench, I also ran the part of the performance benchmark that worked on py3k at the time.

Ronald

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