how to order in python code example

Example 1: python sort list in reverse

#1 Changes list
list.sort(reverse=True)
#2 Returns sorted list
sorted(list, reverse=True)

Example 2: how to sort a list in python

old_list = [3,2,1]
old_list.sort()

Example 3: python sort a list using defined order

>>> sorted(A, key = lambda i: B.index(i[0]))
[[6, 1], [1, 3], [3, 5]]