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Groups > comp.lang.python > #93066

Re: Looking up a dictionary _key_ by key?

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: Looking up a dictionary _key_ by key?
Date 2015-06-24 09:55 +0300
Organization A noiseless patient Spider
Message-ID <87a8vpmw7c.fsf@elektro.pacujo.net> (permalink)
References (1 earlier) <851th2t05t.fsf@benfinney.id.au> <CAGGBd_qaNC38Yg0u_b8+qBAckq6FRTZMxbWwuzV=MUYE_=ZzDw@mail.gmail.com> <mailman.3.1435107726.3674.python-list@python.org> <87a8vpykwq.fsf@nightsong.com> <mailman.7.1435128694.3674.python-list@python.org>

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Ian Kelly <ian.g.kelly@gmail.com>:

> I don't think that it's fundamentally broken. A simple example would
> be the int 3, vs. the float 3, vs. the Decimal 3. All of them compare
> equal to one another, but they are distinct values, and sometimes it
> might be useful to be able to determine which one is actually a key in
> the dict.

One possibility is to enter the key on the value side as well:

    d[key] = (key, value)

    ...

    canonical_key, value = d[key]


Marko

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Thread

Re: Looking up a dictionary _key_ by key? Chris Angelico <rosuav@gmail.com> - 2015-06-24 11:02 +1000
  Re: Looking up a dictionary _key_ by key? Paul Rubin <no.email@nospam.invalid> - 2015-06-23 18:06 -0700
    Re: Looking up a dictionary _key_ by key? Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-24 00:50 -0600
      Re: Looking up a dictionary _key_ by key? Marko Rauhamaa <marko@pacujo.net> - 2015-06-24 09:55 +0300
    Re: Looking up a dictionary _key_ by key? Laura Creighton <lac@openend.se> - 2015-07-05 08:25 +0200

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