Looking up a dictionary _key_ by key?

Date	2015-06-23 17:21 -0700
Subject	Looking up a dictionary _key_ by key?
From	Dan Stromberg <drsalists@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.0.1435105323.3674.python-list@python.org> (permalink)

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I know that sounds strange: usually we look up values by key, not keys.

But suppose you have a strange key type that despite being "equal", is
not identical in some fields, and you need to see those fields.

Is there a way of getting the key used by the dictionary, short of
storing a reference to it in the value, or using a second dictionary?

Thanks!

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Looking up a dictionary _key_ by key? Dan Stromberg <drsalists@gmail.com> - 2015-06-23 17:21 -0700
  Re: Looking up a dictionary _key_ by key? Paul Rubin <no.email@nospam.invalid> - 2015-06-23 18:02 -0700
  Re: Looking up a dictionary _key_ by key? Steven D'Aprano <steve@pearwood.info> - 2015-06-24 11:49 +1000

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