I stormed up a Youtube short which introduced me to repeat from the itertools. I then decided to compare it to range and repeat but it seem very slow. What could be the reason? Below is my code from itertools import repeat from timeit import timeit def range_generator(start, stop, step=1): while start <= stop: yield start start += step def for_range(): for _ in range(999_999_999): ... def for_repeat(): for _ in repeat(None, 999_999_999): ... def for_range_gen(): for _ in range_generator(1, 999_999_999): ... range_time = timeit(for_range, number=1) repeat_time = timeit(for_repeat, number=1) for_range_gen_time = timeit(for_range_gen, number=1) print(f"{range_time:.3f}s") print(f"{repeat_time:.3f}s") print(f"{for_range_gen_time:.3f}s") I tried comparing and timing them all and it turned out my custom generator is way too slow compared to range and repeat. Running the script 3 different times, i got; 28.492s 17.067s 121.059s -------- 32.078s 16.321s 148.467s --------- 29.349s 18.025s 126.159s ChatGPT seem to let me know range and repeat are both implemented in C that's why it much faster than my custom generator. How true is this please? I expect my custom generator should finish way faster than other functions range_time and repeat_time. Continue reading...
