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In-Reply-To: <crvsfb-drf.ln1@chris.zbmc.eu>
References: <crvsfb-drf.ln1@chris.zbmc.eu>
Date: Wed, 1 Oct 2014 06:37:51 -0400
Subject: Re: How to show a dictionary sorted on a value within its data?
From: Joel Goldstick <joel.goldstick@gmail.com>
Cc: "python-list@python.org" <python-list@python.org>
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On Wed, Oct 1, 2014 at 5:58 AM,  <cl@isbd.net> wrote:
> I have a dictionary as follows:-
>
> {
> u'StarterAmps1': Row(id=3D4, ain=3Du'AIN3', name=3Du'StarterAmps1', conv=
=3D6834.374834509803, Description=3Du'Starter Amps'),
> u'LeisureVolts': Row(id=3D1, ain=3Du'AIN0', name=3Du'LeisureVolts', conv=
=3D29.01374215995874, Description=3Du'Leisure Volts'),
> u'RudderPos': Row(id=3D6, ain=3Du'AIN5', name=3Du'RudderPos', conv=3D0.02=
8125, Description=3Du'Rudder Position'),
> u'xx': Row(id=3D7, ain=3Du'AIN6', name=3Du'xx', conv=3D0.028125, Descript=
ion=3Du''),
> u'LeisureAmps1': Row(id=3D3, ain=3Du'AIN2', name=3Du'LeisureAmps1', conv=
=3D32.727273081945, Description=3Du'Leisure Amps'),
> u'StarterVolts': Row(id=3D2, ain=3Du'AIN1', name=3Du'StarterVolts', conv=
=3D28.94469628911757, Description=3Du'Starter Volts')
> }

Is Row a function?  Or do you have a key with a tuple as the value?
>
> I want to output a menu to a user comprising some parts of the
> dictionary (ain and Description) sorted by ain.
>
> Is there some incantation of sorted() that will do what I want?  I
> can't quite fathom out the 'key=3D' parameter needed to sort it by the
> tuple item.  Maybe I need a cmp=3D ?
>
> E.g. I want to do something like:-
>
>     for meas in sorted(adc.cfg, key=3D???):
>         print(adc.cfg[meas].ain, adc.cfg[meas].Description)
>
> What's needed in the ???
>
> --
> Chris Green
> =C2=B7

You might read here:
http://www.pythoncentral.io/how-to-sort-python-dictionaries-by-key-or-value=
/
> --
> https://mail.python.org/mailman/listinfo/python-list



--=20
Joel Goldstick
http://joelgoldstick.com