On 3/21/2019 12:11 PM, Guido van Rossum wrote:
On Thu, Mar 21, 2019 at 7:45 AM Antoine Pitrou
One should also be able to write `d = dict.merge(d1, d2, ...)`
If dict merging is important enough to get a new spelling, then I think
this proposal is the best: explicit, unambiguous, immediately
understandable and easy to remember.
I don't find it easy to understand or remember that d1.update(d2)
modifies d1 in place, while d1.merge(d2) first copies d1.
Maybe the name can indicate the copying stronger? Like we did with
sorting: l.sort() sorts in-place, while sorted(l) returns a sorted copy.
I counted what I believe to be 10 instances of copy-update in the top
level of /lib. Do either of you consider this to be enough that any
addition would be worthwhile.
There are 3 in idlelib that I plan to replace with {**a, **b} and be
done with the issue. I did not check any other packages.
--
Terry Jan Reedy
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