1118.Several scores with validation in python

This is the solution of this problem in python:

x=1
while x==1:
    a=float(input())
    while (a<0 or a>10):
        print("nota invalida")
        a=float(input())

    b=float(input())
    while (b<0 or b>10):
        print("nota invalida")
        b=float(input())

    ave=(a+b)/2
    print("media = %.2f"%ave)
    print("novo calculo (1-sim 2-nao)")
    x=int(input())
    while(x<1 or x>2):
        print("novo calculo (1-sim 2-nao)")
        x=int(input())
        if(x==2):
            break