[Python-ideas] PEP: Dict addition and subtraction
jfine2358 at gmail.com
Wed Mar 6 07:31:13 EST 2019
Rhodri James wrote:
> Making assumptions about length where any dictionary
> manipulations are concerned seems unwise to me
I think you're a bit hasty here. Some assumptions are sensible. Suppose
a = len(d1)
b = len(d2)
c = len(d1 + d2) # Using the suggested syntax.
Then we know
max(a, b) <= c <= a + b
And this is, in broad terms, characteristic of merge operations.
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