Python program to sort table based on given attribute index

Suppose we have a 2d list containing information about athletes. This information is rank, age, height. Each row contains information for different athletes. We also have another number k. We have to sort the data based on kth attribute.

So, if the input is like

Rank	age	height
1	25	190
2	35	180
3	33	185
4	26	175
5	35	180

And k = 1.

then the output will be

Rank	age	height
1	25	190
4	26	175
3	33	185
2	35	180
5	35	180

[[1, 25, 190], [4, 26, 175], [3, 33, 185], [2, 35, 180], [5, 35, 180]]

To solve this, we will follow these steps −

• Call the sort() function for the 2d array called info

• define one function that sort based on kth argument and pass it to the key parameter of sort() function.

Example

Let us see the following implementation to get better understanding

def solve(info, k):
   info.sort(key = lambda x: x[k])
   return info

info = [[1, 25, 190],[2, 35, 180],[3, 33, 185],[4, 26, 175],[5, 35, 180]]
k = 1
print(solve(info, k))

Input

[[1, 25, 190],[2, 35, 180],[3, 33, 185],[4, 26, 175],[5, 35, 180]], 1

Output

[[1, 25, 190], [4, 26, 175], [3, 33, 185], [2, 35, 180], [5, 35, 180]]