Not this one the other one, from a dictionary

[Sion Arrowsmith]

Vlastimil Brom  <vlastimil.brom at gmail.com> wrote:
>>>> other_key = (set(data_dict.iterkeys()) - set([not_wanted_key,])).pop()

other_key = set(data_dict.iterkeys()).difference([not_wanted]).pop()
saves you the construction of an unnecessary set instance. At the
cost of a bit more verbosity, you can get rid of a second set:

key_set = set(data_dict.iterkeys())
key_set.difference_update([not_wanted_key])
other_key = key_set.pop()

although the loss of clarity compared to the one liner can't be
worth the miniscule benefit in this case.

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