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Groups > comp.lang.python > #15664

Re: Multilevel dicts/arrays v. tuples as keys?

From Peter Otten <__peter__@web.de>
Subject Re: Multilevel dicts/arrays v. tuples as keys?
Date 2011-11-14 11:47 +0100
Organization None
References <8f5215a8-d08f-4355-a5a2-77fcaa32c92d@j10g2000vbe.googlegroups.com> <j9qp2t$1lnr$1@ns.felk.cvut.cz>
Newsgroups comp.lang.python
Message-ID <mailman.2695.1321267697.27778.python-list@python.org> (permalink)

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Matej Cepl wrote:

> Dne 11.11.2011 14:31, macm napsal(a):
>> def Dicty( dict[k1][k2] ):
> 
> When looking at this I returned to the question which currently rolls in
> my mind:
> 
> What's difference/advantage-disadvantage betweeng doing multi-level
> dicts/arrays like this and using tuple as a key? I.e., is it more
> Pythonic to have
> 
> dict[k1,k2]
> 
> instead?

If you need lookup only I'd prefer tuples, but sometimes you may want to 
retrieve all values with a certain k1 and

d[k1]

is certainly more efficient than

[(k2, v) for (k1, k2), v in d.items() if k1 == wanted]

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Thread

Get keys from a dicionary macm <moura.mario@gmail.com> - 2011-11-11 05:31 -0800
  Re: Get keys from a dicionary Jon Clements <joncle@googlemail.com> - 2011-11-11 08:09 -0800
    Re: Get keys from a dicionary macm <moura.mario@gmail.com> - 2011-11-11 08:33 -0800
      Re: Get keys from a dicionary macm <moura.mario@gmail.com> - 2011-11-11 08:38 -0800
      Re: Get keys from a dicionary Dave Angel <d@davea.name> - 2011-11-11 11:47 -0500
      Re: Get keys from a dicionary John Gordon <gordon@panix.com> - 2011-11-11 17:28 +0000
  Re: Get keys from a dicionary John Gordon <gordon@panix.com> - 2011-11-11 16:25 +0000
    Re: Get keys from a dicionary macm <moura.mario@gmail.com> - 2011-11-11 08:36 -0800
  Re: Get keys from a dicionary Gelonida N <gelonida@gmail.com> - 2011-11-11 18:29 +0100
  Re: Get keys from a dicionary Gelonida N <gelonida@gmail.com> - 2011-11-11 18:45 +0100
    Re: Get keys from a dicionary John Gordon <gordon@panix.com> - 2011-11-11 17:51 +0000
  Re: Get keys from a dicionary alex23 <wuwei23@gmail.com> - 2011-11-13 21:42 -0800
  Re: Get keys from a dicionary alex23 <wuwei23@gmail.com> - 2011-11-13 21:44 -0800
  Multilevel dicts/arrays v. tuples as keys? [Was: Re: Get keys from a dicionary] Matej Cepl <mcepl@redhat.com> - 2011-11-14 11:05 +0100
    Re: Multilevel dicts/arrays v. tuples as keys? [Was: Re: Get keys from a dicionary] Tim Golden <mail@timgolden.me.uk> - 2011-11-14 10:42 +0000
    Re: Multilevel dicts/arrays v. tuples as keys? Peter Otten <__peter__@web.de> - 2011-11-14 11:47 +0100
      Re: Multilevel dicts/arrays v. tuples as keys? alex23 <wuwei23@gmail.com> - 2011-11-14 19:07 -0800

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