python

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
led=21
bt=20
GPIO.setup(led,GPIO.OUT)
GPIO.setup(bt,GPIO.IN,pull_up_down=GPIO.PUD_UP)
ledStatus=False
n=1
try:
    while True:
        time.sleep(0.01)
        if(GPIO.input(bt)==GPIO.LOW):
            time.sleep(0.03)
            if(GPIO.input(bt)==GPIO.HIGH):
                print('button pressed',n)
                n=n+1
                ledStatus=not ledStatus
                if ledStatus:
                    GPIO.output(led,GPIO.HIGH)
                else:
                    GPIO.output(led,GPIO.LOW)
except KeyboardInterrupt:
    pass
GPIO.cleanup()