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I have a list of dictionaries. They all have the same keys. I want to find the
set of keys where all the dictionaries have the same values. Suggestions?

Neal Becker writes:

> I have a list of dictionaries. They all have the same keys. I want
> to find the set of keys where all the dictionaries have the same
> values. Suggestions?

Literally-ish:
{ key for key, val in ds[0].items() if all(val == d[key] for d in ds) }

Neal Becker <> writes:
> I have a list of dictionaries. They all have the same keys. I want to find the
> set of keys where all the dictionaries have the same values. Suggestions?

Untested, and uses a few more comparisons than necessary:

# ds = [dict1, dict2 ... ]

d0 = ds[0]
ks = set(k for k in d0 if all(d[k]==d0[k] for d in ds))