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Re: Sort list of dictionaries

References (1 earlier) <mailman.56.1425321135.13471.python-list@python.org> <946797be-10e6-433b-9411-2db0d5697ac8@googlegroups.com> <8ccd65d8-3f1f-41ac-9092-9b0832d2fc49@googlegroups.com> <mailman.61.1425324201.13471.python-list@python.org> <432a0d61-a8ba-46ca-bc53-318e234fe168@googlegroups.com>
Date 2015-03-04 03:09 +1100
Subject Re: Sort list of dictionaries
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.22.1425398950.21433.python-list@python.org> (permalink)

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On Wed, Mar 4, 2015 at 2:56 AM, Charles Heizer <ceh329@gmail.com> wrote:
>> Personally, I prefer to not use a lambda:
>>
>> def name_version(elem):
>>     return elem['name'], LooseVersion(elem['version'])
>>
>> result = sorted(mylist, key=name_version, reverse=True)
>
> Peter, thank you. Me being new to Python why don't you prefer to use a lambda?

Using lambda is fine if it's really clear what's going on (usually, if
it's an extremely simple function), but if your expression goes across
multiple lines because of the function parameter, it's usually simpler
to break the function out into a separate def statement and then use
that. There's ultimately no difference[1] between a lambda function
and a def function, apart from the fact that a function created with
lambda always has the name "<lambda>".

ChrisA

[1] Modulo bugs, eg a weird edge case with lambda and yield; certainly
no intentional difference.

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Thread

Sort list of dictionaries Charles Heizer <ceh329@gmail.com> - 2015-03-02 10:17 -0800
  Re: Sort list of dictionaries Emile van Sebille <emile@fenx.com> - 2015-03-02 10:31 -0800
    Re: Sort list of dictionaries Charles Heizer <ceh329@gmail.com> - 2015-03-02 10:38 -0800
      Re: Sort list of dictionaries Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-02 11:55 -0700
      Re: Sort list of dictionaries Charles Heizer <ceh329@gmail.com> - 2015-03-02 10:58 -0800
        Re: Sort list of dictionaries Peter Otten <__peter__@web.de> - 2015-03-02 20:23 +0100
          Re: Sort list of dictionaries Charles Heizer <ceh329@gmail.com> - 2015-03-03 07:56 -0800
            Re: Sort list of dictionaries Chris Angelico <rosuav@gmail.com> - 2015-03-04 03:09 +1100
              Re: Sort list of dictionaries Paul  Moore <p.f.moore@gmail.com> - 2015-03-03 08:48 -0800
            Re: Sort list of dictionaries Peter Otten <__peter__@web.de> - 2015-03-03 18:44 +0100
      Re: Sort list of dictionaries Dave Angel <davea@davea.name> - 2015-03-02 13:59 -0500
      Re: Sort list of dictionaries Jason Friedman <jsf80238@gmail.com> - 2015-03-02 22:33 -0700
      Re: Sort list of dictionaries Chris Angelico <rosuav@gmail.com> - 2015-03-03 18:07 +1100
      Re: Sort list of dictionaries Jason Friedman <jsf80238@gmail.com> - 2015-03-03 07:45 -0700
      Re: Sort list of dictionaries Chris Angelico <rosuav@gmail.com> - 2015-03-04 01:50 +1100
  Re: Sort list of dictionaries Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-03 18:55 +1100

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