On 2019-02-27 17:37, Guido van Rossum wrote:
On Wed, Feb 27, 2019 at 9:34 AM George Castillo <[email protected]
<mailto:[email protected]>> wrote:
The key conundrum that needs to be solved is what to do for `d1
+ d2` when there are overlapping keys. I propose to make d2 win
in this case, which is what happens in `d1.update(d2)` anyways.
If you want it the other way, simply write `d2 + d1`.
This would mean that addition, at least in this particular instance,
is not a commutative operation. Are there other places in Python
where this is the case?
Yes there are. 'a' + 'b' is not the same as 'b' + 'a'.
For non-numbers we only require + to be associative, i.e. a + b + c ==
(a + b) + c == a + (b + c).
That is satisfied for this proposal.
Are there any advantages of using '+' over '|'?
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