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From: Random832 <random832@fastmail.com>
Newsgroups: comp.lang.python
Subject: Re: Set Operations on Dicts
Date: Mon, 08 Feb 2016 09:52:43 -0500
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On Mon, Feb 8, 2016, at 08:32, Matt Wheeler wrote:
> On 8 February 2016 at 12:17, Jussi Piitulainen
> <jussi.piitulainen@helsinki.fi> wrote:
> > Also, what would be the nicest current way to express a priority union
> > of dicts?
> >
> > { k:(d if k in d else e)[k] for k in d.keys() | e.keys() }
> 
> Since Python 3.5: {**e, **d}

And before that... dict(ChainMap(d, e))