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Feb. 18, 2015
4:08 a.m.
C Anthony Risinger writes:
I'm not versed enough in the math behind it to know if it's expected or not, but as it stands, to remain compatible with sets, `d1 | d2` should behave like it does in my code (prefer the first, not the last). I kinda like this, because it makes dict.__or__ a *companion* to .update(), not a replacement (since update prefers the last).
But this is exactly the opposite of what the people who advocate use of an operator want. As far as I can see, all of them want update semantics, because that's the more common use case where the current idioms feel burdensome.