1117.Score Validation in python

This is the solution of this problem in python:

X=float(input())
while (X<0 or 10<X):
    print("nota invalida")
    X=float(input())
Y=float(input())
while (Y<0 or 10<Y):
    print("nota invalida")
    Y=float(input())
avarage=(X+Y)/2
print("media = %.2f"%avarage)