[issue9705] limit dict.update() to a given list of keys

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

FWIW, the usual way to spell this in Python is:

 my_dict_1.update((k, my_dict_2[k]) for k in ['a', 'c'])

We try to keep filtering operations separate from map/fold operations for orthognality.

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nosy: +rhettinger

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