#validWhile.py
#data validity checking examples

num = eval(input("Enter a number between 1 and 10: "))

  #true if invalid, i.e. out of range
while num<1 or num>10:
    print("Error.  Invalid data. Try again.")
    num = eval(input("Enter a number between 1 and 10: "))
print("It's now between 1 and 10, inclusive:", num)


 
num = eval(input("Enter 2, 4, or 7: "))

while num!=2 and num!=4 and num!=7:
    print("it's not 2 nor 4 and not 7")
    num = eval(input("Enter 2, 4, or 7: "))
print("It's now either 2 or 4 or 7:", num)    



size = input("Enter size category (S, M, L): ").upper()
while size!='S' and size!='M' and size!='L':
    print("Invalid size category. Do it again.")
    size = input("Enter size category (S, M, L): ").upper()
print("It's now either S, M, or L:", size)