[Python-ideas] Adding "+" and "+=" operators to dict

[Ron Adam]

On 02/15/2015 05:14 PM, Neil Girdhar wrote:
> I'm also +1, I agree with Donald that "|" makes more sense to me than "+"
> if only for consistency with sets.  In mathematics a mapping is a set of
> pairs (preimage, postimage), and we are taking the union of these sets.

An option might be to allow a union "|" if both the (key, value) pairs that 
match in each are the same.  Other wise, raise an exception.

Ron