How to execute loops in parallel in python(2.7)?

Question

Python

I'm trying to learn python. I broke my whole head ... I have python 2.7 on the raspberry pi 3, I'm trying to run two stepper motors at the same time.
There is such a design:

step_timeout = 0.0000000001
impulse_timeout =0.00075

for i in range(0,850):
    GPIO.output(19, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(19, GPIO.LOW)
    time.sleep(step_timeout)

    GPIO.output(13, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(13, GPIO.LOW)
    time.sleep(step_timeout)

    GPIO.output(6, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(6, GPIO.LOW)
    time.sleep(step_timeout)

    GPIO.output(5, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(5, GPIO.LOW)
    time.sleep(step_timeout)

And then there is this design:

step_timeout = 0.002
impulse_timeout =0.001

for i in range(0,800):
    GPIO.output(12, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(12, GPIO.LOW)
    time.sleep(step_timeout)

    GPIO.output(16, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(16, GPIO.LOW)
    time.sleep(step_timeout)

    GPIO.output(20, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(20, GPIO.LOW)
    time.sleep(step_timeout)

    GPIO.output(21, GPIO.HIGH)
    time.sleep(impulse_timeout)
    GPIO.output(21, GPIO.LOW)
    time.sleep(step_timeout)

How can I make these two loops run at the same time?

Answer 1

you need to write asynchronous tasks in asyncio

Answer 2

Make one quick cycle that will decide who and when to twitch. Forget about sleep altogether and instead make loop iteration counters.