Python 为什么我看不懂；“探测到火灾”；当火焰传感器为真时，在firebase上？

下面是我的flame sensor代码，它通过python和raspberry pi在firebase上运行。我只需要看看火，它不工作了

import RPi.GPIO as GPIO
import time

channel = 21

def callback(channel):
           print("Fire Detected")
x = GPIO.add_event_detect(channel, GPIO.BOTH, bouncetime = 300)
y = GPIO.add_event_detect(channel, callback)

while True:
      if x is True:
       
db.child("account").child("email_password").child("p@gmail.com").child("write").child("flame").set("Fire Detected")
else: 
  
db.child("account").child("email_password").child("p@gmail.com").child("write").child("flame").set("Fire not Detected")

data = {
"flame": str(x)
}
db.child("account").child("email_password").child("p@gmail.com").child("write").set(data)
time.sleep(1)

GPIO.cleanup()