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Groups > comp.lang.python > #102685

Re: Set Operations on Dicts

From Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups comp.lang.python
Subject Re: Set Operations on Dicts
Date 2016-02-08 09:12 -0700
Message-ID <mailman.106.1454948013.2317.python-list@python.org> (permalink)
References <mailman.86.1454925476.2317.python-list@python.org> <n9a2jk$9s$1@dont-email.me>

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On Mon, Feb 8, 2016 at 5:47 AM, Grobu <snailcoder@retrosite.invalid> wrote:
> You can use dictionary comprehension :
>
> Say :
> dict1 = {'a': 123, 'b': 456}
> set1 = {'a'}
>
> intersection :
>>>> { key:dict1[key] for key in dict1 if key in set1 }
> {'a': 123}
>
> difference :
>>>> { key:dict1[key] for key in dict1 if not key in set1 }
> {'b': 456}

dict does already expose set-like views. How about:

{k: d[k] for k in d.keys() & s}  # d & s
{k: d[k] for k in d.keys() - s}  # d - s

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Thread

Set Operations on Dicts Marco Kaulea <marco.kaulea@gmail.com> - 2016-02-08 10:56 +0100
  Re: Set Operations on Dicts Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-02-08 14:17 +0200
    Re: Set Operations on Dicts Marco Kaulea <marco.kaulea@gmail.com> - 2016-02-08 13:33 +0100
    Re: Set Operations on Dicts Matt Wheeler <m@funkyhat.org> - 2016-02-08 13:32 +0000
      Re: Set Operations on Dicts Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-02-08 16:02 +0200
    Re: Set Operations on Dicts Random832 <random832@fastmail.com> - 2016-02-08 09:52 -0500
      Re: Set Operations on Dicts Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-02-08 17:05 +0200
  Re: Set Operations on Dicts Grobu <snailcoder@retrosite.invalid> - 2016-02-08 13:47 +0100
    Re: Set Operations on Dicts Ian Kelly <ian.g.kelly@gmail.com> - 2016-02-08 09:12 -0700
      Re: Set Operations on Dicts Grobu <snailcoder@retrosite.invalid> - 2016-02-09 08:21 +0100
        Re: Set Operations on Dicts Ian Kelly <ian.g.kelly@gmail.com> - 2016-02-09 08:14 -0700

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