[Python-ideas] PEP: Dict addition and subtraction

Brandt Bucher brandtbucher at gmail.com
Thu Mar 21 14:43:42 EDT 2019

I'd also like to add what I consider to be another point in favor of an

Throughout all of these related threads, I have seen many typos and
misspellings of current dict merging idioms, from messing up the number of
asterisks in "{**a, **b}", to even Guido(!) accidentally writing the common
copy/update idiom as

d = d1.copy()
d = d1.update(d2)

in a thoughtful email... and it was then copied-and-pasted (unquoted and
verbatim) by others!

I still have yet to see somebody (even those who claim to be confused by
it) mess up the PEP's current definition of "+" or "+=" in this context.

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