[Python-ideas] PEP: Dict addition and subtraction
Jonathan Fine
jfine2358 at gmail.com
Thu Mar 21 13:42:15 EDT 2019
Steven D'Aprano wrote:
> But if you have *concrete examples* of code that currently is easy to
> understand, but will be harder to understand if we add dict.__add__,
> then please do show me!
# What does this do?
>>> items. update(points)
# And what does this do?
>>> items += points
What did you get? Here's one possible context.
>>> Point = namedtuple('Point', ['x', 'y'])
>>> p, q, r = Point(1,2), Point(3, 4), Point(5, 6)
>>> points = set([p, q, r])
>>> points
{Point(x=1, y=2), Point(x=5, y=6), Point(x=3, y=4)}
>>> items = dict(a=4, b=8)
--
Jonathan
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