Guess the number

from random import randrange
import sys
score = 0
Number = randrange(1,20)
nr = int(raw_input("Guess the number!"))
while nr <> Number:
    if nr > Number:
        print "That's too high!"
        score += 1
        nr = int(raw_input("Try again!"))
    if nr < Number:
        print "That's too low!"
        score += 1
        nr = int(raw_input("Try again!"))
    if nr == Number:
        print "Well done, %r was the number!" % nr
        print "You did it in %r tries" % score
        sys.exit(0)