[issue36431] Use dict unpacking for merging two dicts

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

3 years ago, Trey Hunter found 11 ways to merge to a new dict.
https://treyhunner.com/2016/02/how-to-merge-dictionaries-in-python/
He followed up with a performance comparison.
https://gist.github.com/treyhunner/f35292e676efa0be1728
** unpacking was nearly twice as fast as the 2nd place methods.
(Bigger dict might change the ratio, but I expect ** unpacking to remain first.)

Trey's summary: "This is simple and Pythonic. There are quite a few symbols, but it’s fairly clear that the output is a dictionary at least."  I consider the last point a major plus.

User comment: "Beautiful. Pythonic. Thank you."  No negatives.

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nosy: +terry.reedy

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<https://bugs.python.org/issue36431>
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