Custom sort order

custom_sort_order.py

colors = ["cyan", "magenta", "yellow", "black"]


def compare_length(c1, c2):
    if len(c1) < len(c2):
        return -1
    if len(c1) > len(c2):
        return 1
    return 0


# Python 2 ❌
print(sorted(colors, cmp=compare_length))

# Python 3 ❌
from functools import cmp_to_key
print(sorted(colors, key=cmp_to_key(compare_length)))

# ✔️
print(sorted(colors, key=len))