sort help

Chris Angelico rosuav at gmail.com
Wed Sep 23 00:55:24 CEST 2015


On Wed, Sep 23, 2015 at 8:42 AM, Larry Martell <larry.martell at gmail.com> wrote:
> I currently have 3 lists of lists and I sort them based on a common
> field into a single list like this:
>
>         def GetObjKey(a):
>             return a[2]
>
>         sorted(a + b + c, key=GetObjKey)
>
> Which works just fine.
>
> But now, I need to have just the first list (a) also sub sorted by
> another field and I can't quite figure out how to do this.

Have you tried simply sorting a by the other field prior to doing your
merge-and-sort? The Python list.sort() method is guaranteed to be
stable. I can't find a comparable guarantee for sorted(), but worst
case, you should be able to do your list merge, and then explicitly
name it and sort it.

ChrisA


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