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On Thu, Feb 12, 2015 at 6:13 AM, Steven D'Aprano <steve@pearwood.info> wrote:
I certainly wouldn't want to write
new_dict = a + b + c + d
and have O(N**2) performance when I can do this instead
It would likely not be O(N), but O(N**2) seems exaggerated. Besides, the most common cases would be: new_dict = a + b old_dict += a Both of which can be had in O(N).
new_dict = {} for old_dict in (a, b, c, d): new_dict.update(old_dict)
It would be easier if we could do: new_dict = {} new_dict.update(a, b, c, d) It would also be useful if dict.update() returned self, so this would be valid: new_dict = {}.update(a, b, c, d) If that was so, then '+' could perhaps be implemented in terms of update() with the help of some smarts from the parser. Cheers, -- Juancarlo *Añez*