While true loop Python

import RPi.GPIO as GPIO
import time
#from picamera import PiCamera
from time import sleep
from gpiozero import MotionSensor
import smtplib

sender = '*****@gmail.com'
reciever = '*****@gmail.com'

def BlueLED (): #Blue LED Function 

    GPIO.output(27, GPIO.HIGH)
    time.sleep(3)
    GPIO.output(27, GPIO.LOW)


def RedLED (): #Red LED Function

    GPIO.output(22,GPIO.HIGH)
    time.sleep(3)
    GPIO.output(22, GPIO.LOW)

def Buzzer (): #Buzzer Function 

    GPIO.output(17, GPIO. HIGH)
    time.sleep(3)
    GPIO.output(17, GPIO.LOW)


def email(sender,reciever,msg):
    try :
        server = smtplib.SMTP('smtp.gmail.com',587)
        server.ehlo()
        server.starttls()
        server.login(sender,'******')
        server.sendmail(sender,reciever,msg)
        server.close()

        print('Email sent!')

    except :
        print('Error')
    
try :

    GPIO.setmode(GPIO.BCM)
    #camera = PiCamera()
    pir = MotionSensor(4)
    GPIO.setwarnings(False)
    
    
    GPIO.setup(27, GPIO.OUT) #blueLED
    GPIO.setup(22, GPIO.OUT) #redLED
    GPIO.setup(17, GPIO.OUT) #buzzer
    GPIO.setup(18, GPIO.OUT) #tempsensor

    GPIO.setup(21, GPIO.IN, pull_up_down = GPIO.PUD_UP) #entry button

    count = 0

    while True :

        if (pir.motion_detected):
            print('Motion Detected')

            #Calling the buzzer function 
            #Buzzer()

            #The content that is going to be sent via email 

                       
            msg = """Subject : Car Park 

            (Picture) """

            email(sender,reciever,msg)

          
    

            print('\nPlease press the button for the gate to open')

         

            while True :

                if(GPIO.input(21) == False):
                    if (count < 5):
                        BlueLED()
                        print('\nThere are ',(5-count), ' parking spaces empty ')

                    else :
                        RedLED()
                        print('\nSorry but the parking is full')
                        
                    count = count + 1

                   

except Exception as ex :
    print('Error occured',ex)