program to check the validity of a Password

import re

password = "D@m@_u0rtu9e$"

flag = 0

while True:

if (len(password)<8):

flag = -1

break

elif not re.search("[a-z]", password):

flag = -1

break

elif not re.search("[A-Z]", password):

flag = -1

break

elif not re.search("[0-9]", password):

flag = -1

break

elif not re.search("[_@$]", password):

flag = -1

break

elif re.search("\s", password):

flag = -1

break

else:

flag = 0

print("Valid Password")

break

if flag ==-1:

print("Not a Valid Password")