Sorting on multiple values, some ascending, some descending

[bearophileHUGS at lycos.com]

dwelden wrote:
> >    L.sort(key=lambda r: r.secondary, reverse=True)
> >    L.sort(key=lambda r: r.primary)
> Excellent! That looks just like what I needed.

Note that there is the (probably little used) operator.attrgetter()
too, with that you can avoid the possibly slow lambda:
L.sort(key=attrgetter("primary")

operator.itemgetter(n) is when you have items that can be be accessed
by index.

Bye,
bearophile