CODEWITHSUNDEEP
pythonlistsorting
Santiago Ramirez
Santiago Ramirez

Reputation: 13

sorting a list with sub-lists in python

So I have this list with sublists: 

[[39, 4, 43], [23, 3, 26], [46, 5, 51], [66, 15, 51], [66, 7, 73], [10, 2, 12], [79, 8, 87]]

I need to sort the lists in order of the third element in each sub-list. But in case two or more of them are equals like in this case: 

[46, 5, 51], [66, 15, 51]

the algorithm when sorting should put first the sublist with the biggest first element, so the wanted output should be like this.

 [[79, 8, 87],[66, 7, 73],[66, 15, 51],[46, 5, 51],[39, 4, 43],[23, 3, 26],[10, 2, 12]]

Any tip to go through this? thanks or your time and help

Upvotes: 1

Views: 1181

Answers (2)

Jacques Gaudin
Jacques Gaudin

Reputation: 17008

There is also itemgetter to do this kind of sorting:

from operator import itemgetter

l = [[39, 4, 43], [23, 3, 26], [46, 5, 51], [66, 15, 51], [66, 7, 73], [10, 2, 12], [79, 8, 87]]

sorted(l, key=itemgetter(2, 0), reverse=True)

Upvotes: 2

Christian Sloper
Christian Sloper

Reputation: 7510

You can set up your sort order as a tuple like this:

l = [[39, 4, 43], [23, 3, 26], [46, 5, 51], [66, 15, 51], [66, 7, 73], [10, 2, 12], [79, 8, 87]]

sorted(l, key = lambda x: (x[2],x[0]), reverse=True)

result:

[[79, 8, 87], [66, 7, 73], [66, 15, 51], [46, 5, 51], [39, 4, 43], [23, 3, 26], [10, 2, 12]]

Upvotes: 8

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