Keys in dict and keys not in dict

Mon Mar 19 00:18:52 EDT 2018

Chris Angelico <rosuav at gmail.com> writes:
> Sounds like a set operation to me.
>> expected = {"foo", "bar", "spam"}
> missing = expected - set(json)

That works (because iterating a dict returns its keys). But it is less
immediately understandable, IMO, than this::
 expected = {"foo", "bar", "spam"}
 missing = expected - set(json.keys())
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