[Python-ideas] PEP: Dict addition and subtraction

Terry Reedy tjreedy at udel.edu
Fri Mar 15 13:34:05 EDT 2019

On 3/15/2019 11:21 AM, Steven D'Aprano wrote:
> On Fri, Mar 15, 2019 at 11:54:51AM -0300, Andre Roberge wrote:
>> On Fri, Mar 15, 2019 at 11:42 AM Steven D'Aprano <steve at pearwood.info>
>> wrote:
>>> [snip]
>>> I still remember being told in no uncertain terms by the core devs that
>>> adding a clear() method to lists was a waste of time because there was
>>> already a perfectly good way to spell it with slicing. And then ABCs
>>> came along and now lists have a clear method. So opinions change too.
>>> I agree with the opinions expressed in the (partially) quoted message
>> but I don't think that this is how this particular change happened.
>> https://mail.python.org/pipermail/python-ideas/2009-April/003897.html
> You proposed that in April 2009, but there was nothing added to the bug
> tracker for 18 months until it was finally added by Terry Reedy in

Actually, I opened the tracker issue with a succinct message,
after the discussion and Guido's approval changed my mind.
However, Eli Bendersky wrote the patch with help from others and then 
merged it.

> November 2010, based on discussion in a completely different thread (one
> about sets!):
> https://mail.python.org/pipermail/python-ideas/2010-November/008722.html

Terry Jan Reedy

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