Christian Heimes christian at python.org
Sat Dec 17 06:44:38 EST 2016

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On 2016-12-17 10:06, Serhiy Storchaka wrote:
> On 16.12.16 21:24, Guido van Rossum wrote:
>> e.g. the argument to getattr() -- I still hear of code that breaks due
>> to this occasionally)
> 
> What is the problem with unicode in getattr()? Unicode attribute name is
> converted to str, and since the result is cached, this even don't add
> much overhead.

It breaks the str optimization of dicts. Dict with str-only keys are
special-cased in Python 2.

Christian

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