python sort array custom comparator code example

Example 1: python sort array custom comparator

l = [{'prop': 2}, {'prop': 3}, {'prop': 1}]

l.sort(key=lambda x: x['prop'])

Example 2: how to use custom comparator for sorting in python

def compare(item1, item2):
    if fitness(item1) < fitness(item2):
        return -1
    elif fitness(item1) > fitness(item2):
        return 1
    else:
        return 0

# Calling
list.sort(key=compare)