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Groups > comp.lang.python > #75480
| From | Ned Batchelder <ned@nedbatchelder.com> |
|---|---|
| Subject | Re: dict to boolean expression, how to? |
| Date | 2014-08-01 10:29 -0400 |
| References | <53db8bd8$0$2976$e4fe514c@news2.news.xs4all.nl> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.12514.1406903366.18130.python-list@python.org> (permalink) |
On 8/1/14 8:45 AM, Alex van der Spek wrote:
> With a dict like so:
>
> cond = {'a': 1, 'b': 1, 'c': 1,
> 'A': 0, 'B', 0, 'C':0}
>
> how would you make a boolean expression like this:
>
> bool = (('a' == 1) & ('A' == 0) |
> ('b' == 1) & ('B' == 0) |
> ('c' == 1) & ('C' == 0))
>
> The fact that lowercase and uppercase keys are stringed together with & is
> intentional albeit the actual condition is a bit more tricky.
>
> I've tried several approaches using eval() on a string built from the dict
> but landed with just spelling it out literally.
>
>
> Any pointers welcome.
> Alex
>
Are you looking for this?
bool = (
(cond['a'] == 1 and cond['A'] == 0) or
(cond['b'] == 1 and cond['B'] == 0) or
(cond['c'] == 1 and cond['C'] == 0)
)
If so, what's wrong with that expression exactly? I'm not sure how eval
could enter into it, so I feel like I'm missing something.
--
Ned Batchelder, http://nedbatchelder.com
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dict to boolean expression, how to? Alex van der Spek <zdoor@xs4all.nl> - 2014-08-01 12:45 +0000
Re: dict to boolean expression, how to? Chris Angelico <rosuav@gmail.com> - 2014-08-01 23:04 +1000
Re: dict to boolean expression, how to? Roy Smith <roy@panix.com> - 2014-08-01 09:24 -0400
Re: dict to boolean expression, how to? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-01 13:28 +0000
Re: dict to boolean expression, how to? Roy Smith <roy@panix.com> - 2014-08-01 09:32 -0400
Re: dict to boolean expression, how to? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-01 15:02 +0000
Re: dict to boolean expression, how to? Terry Reedy <tjreedy@udel.edu> - 2014-08-01 18:16 -0400
Re: dict to boolean expression, how to? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-01 16:50 +0100
Re: dict to boolean expression, how to? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-01 16:35 +0000
Re: dict to boolean expression, how to? Alex van der Spek <zdoor@xs4all.nl> - 2014-08-01 14:26 +0000
Re: dict to boolean expression, how to? marco.nawijn@colosso.nl - 2014-08-01 08:07 -0700
Re: dict to boolean expression, how to? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-01 15:24 +0000
Re: dict to boolean expression, how to? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-01 17:03 +0100
Re: dict to boolean expression, how to? Peter Otten <__peter__@web.de> - 2014-08-01 17:44 +0200
eval [was Re: dict to boolean expression, how to?] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-02 02:59 +0000
Re: eval [was Re: dict to boolean expression, how to?] Peter Otten <__peter__@web.de> - 2014-08-02 09:43 +0200
Re: eval [was Re: dict to boolean expression, how to?] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-02 08:59 +0100
Re: eval [was Re: dict to boolean expression, how to?] Duncan Booth <duncan.booth@invalid.invalid> - 2014-08-05 11:57 +0000
Re: eval [was Re: dict to boolean expression, how to?] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-06 02:25 +1000
Re: dict to boolean expression, how to? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-01 17:12 +0100
Re: dict to boolean expression, how to? Peter Pearson <ppearson@nowhere.invalid> - 2014-08-01 17:00 +0000
Re: dict to boolean expression, how to? Ned Batchelder <ned@nedbatchelder.com> - 2014-08-01 10:29 -0400
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