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