[Python-ideas] PEP: Dict addition and subtraction

[Greg Ewing]

Ka-Ping Yee wrote:
> len(dict1 + dict2) does not equal len(dict1) + len(dict2), so using the 
> + operator is nonsense.

You might as well say that using the + operator on vectors is
nonsense, because len(v1 + v2) is not in general equal to
len(v1) + len(v2).

Yet mathematicians are quite happy to talk about "addition"
of vectors.

-- 
Greg