import RPi.GPIO as GPIO
import time
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(7, GPIO.IN)         #Read output from PIR motion sensor

while True:
       i=GPIO.input(7)
       if i==0:                 #When output from motion sensor is LOW
             print ("No intruders",i)
             time.sleep(0.1)
       elif i==1:               #When output from motion sensor is HIGH
             print ("Intruder detected",i)
             time.sleep(0.1)

Intruder detected 1
Intruder detected 1
Intruder detected 1
Intruder detected 1

Intruder detected 1
No intruders 0
Intruder detected 1
No intruders 0
Intruder detected 1
No intruders 0
No intruders 0
Intruder detected 1