I split off a separate thread on python-ideas [1] specific to the idea of introducing "+" and "+=" operators on a dict.
[1] https://mail.python.org/pipermail/python-ideas/2015-February/031748.html ~ Ian Lee On Tue, Feb 10, 2015 at 10:35 PM, John Wong <gokoproj...@gmail.com> wrote: > > > On Wed, Feb 11, 2015 at 12:35 AM, Ian Lee <ianlee1...@gmail.com> wrote: > >> +1 for adding "+" or "|" operator for merging dicts. To me this operation: >> >> >>> {'x': 1, 'y': 2} + {'z': 3} >> {'x': 1, 'y': 2, 'z': 3} >> >> Is very clear. The only potentially non obvious case I can see then is >> when there are duplicate keys, in which case the syntax could just be >> defined that last setter wins, e.g.: >> >> >>> {'x': 1, 'y': 2} + {'x': 3} >> {'x': 3, 'y': 2} >> >> Which is analogous to the example: >> >> new_dict = dict1.copy() >> new_dict.update(dict2) >> >> >> Well looking at just list > a + b yields new list > a += b yields modified a > then there is also .extend in list. etc. > > so do we want to follow list's footstep? I like + because + is more > natural to read. Maybe this needs to be a separate thread. I am actually > amazed to remember dict + dict is not possible... there must be a reason > (performance??) for this... >
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