Sorting part of a list of tuples

Question

I have a list name,weight,height like this:

list1 = [('jacob', 75, 180)
         ('sam', 90, 190)
         ('sara', 75, 175)
         ('bob', 60, 175)]

First I want to sort it by height(MAX to MIN) and I've done it. Then if the heights are the same, just sort those with same heights, by weight(MIN to MAX).

I get this:

list1 = [('sam', 190, 90)
         ('jacob', 180, 75)
         ('sara', 175, 75)
         ('bob', 175, 60)]

But I want this:

my_list = [('sam', 190, 90),
           ('jacob', 180, 75),
           ('bob', 175, 60),
           ('sara', 175, 75)]

yatu · Accepted Answer · 2019-09-17T15:31:35.093

Assiming you don't actually mind about the order (for some reason you changed it in the output), you can use sorted with a key, where by using a negative sign you can force the ordering of a given list element to be ascending:

sorted(list1, key=lambda x: (-x[2], x[1]))

[('mahdi', 90, 190),
 ('amin', 75, 180),
 ('ahmad', 60, 175),
 ('mohamad', 75, 175)]

Otherwise simply rearange the tuples with a list comprehension:

[(i,k,j) for i,j,k in sorted(list1, key=lambda x: (-x[2], x[1]))]

[('mahdi', 190, 90),
 ('amin', 180, 75),
 ('ahmad', 175, 60),
 ('mohamad', 175, 75)]

Sorting part of a list of tuples

1 Answers1