python sort function

Question

sub_li =[['rishav', 10], ['akash', 5], ['ram', 20], ['gaurav', 15]]
a=sub_li.sort(key = lambda x: x[1])

print(a)
why am i getting none as a output not the sorted list

why am i getting none when i should get the sorted list

Answer 1

Because the sort() function does not work like this. It actually changes your original list (in-place sorting).
So you can do like:
sub_li.sort()
print(sub_li)

Or:
a = sorted(sub_li)
print(a)

You can use the key parameter with both ways

Answer 2

Thanks