[Python] How to run ESC Brushless Motor on raspberry Pi using Python?

I am a very new to raspberry pi and hardware. I am trying to spin a brushless motor with ESC. below is the code (taken from a youtube video) that spins the motor till 9 and then slows it down till 4. but I want to run the motor without loops and without changing the duty cycles. Means when i run the program the motor should spin and when i stop the program the motor should stop spinning. Please update the below code.

Sorry for my bad English. I hope I am clear what I need.

Below is the code that I have taken from a video.

Code:

p = GPIO.PWM(7, 50)

p.start(0)
print ("starting 0")
time.sleep(3)

p.ChangeDutyCycle(3)
print("start")
time.sleep(5)



while True:
i = 4
while i<10:

print(i)
p.ChangeDutyCycle(i)
time.sleep(.05)
i +=.02

while i>4:
print(i)
p.ChangeDutyCycle(i)
time.sleep(.05)
i -=.05

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