#! /usr/bin/env python3

def endless():
    "Endless Range Replacement"
    start = 0
    while True:
        yield start
        start += 1

it1 = range(10, 15)
it2 = range(100, 105)

# Zip iteriert ueber alle angegebenen Iterables parallel
for a, b, idx in zip(it1, it2, endless()):
    print(idx, a, b)
