Itertools module test use.

itertool.py

import itertools

for x in itertools.count(50, 5):
    print(x)
    if x == 80:
        break

for x in itertools.count(50):
    print(x)
    if x == 80:
        break

colorsForPainting = ["Red", "Blue", "Yellow", "Green", "Orange", "Purple"]

for c in itertools.combinations(colorsForPainting, 3):
    print(c)