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| References | <CACwCsY71moXc+72Y5CT6B2+_8d8cPNFyq7zG49STYWcZ5gfkEA@mail.gmail.com> <CAPTjJmrGj-aPYj7pS6zFcobRVj-OpM6oHq9q2OgC-RF+gG1b-A@mail.gmail.com> |
|---|---|
| Date | 2015-09-23 08:21 -0400 |
| Subject | Re: sort help |
| From | Larry Martell <larry.martell@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.103.1443010898.28679.python-list@python.org> (permalink) |
On Tue, Sep 22, 2015 at 6:55 PM, Chris Angelico <rosuav@gmail.com> wrote: > On Wed, Sep 23, 2015 at 8:42 AM, Larry Martell <larry.martell@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. Thanks to everyone for the replied. I ended up just presorting he first list, then merging and sorting all 3. Very simple. Not sure why I didn't see that. Probably comes from working 75 hours/week.
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Re: sort help Larry Martell <larry.martell@gmail.com> - 2015-09-23 08:21 -0400
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