def square_calculator(question):
    error = "Please enter an number higher than 0"
    while True:
        try:
            side = float(input(question))
            if side > 0:
                return side
            else:
                print(error)

        except ValueError:
            print(error)


length=square_calculator("enter the size of your side: ")
area=(length*length)
perimeter=(length+length+length+length)

print(f"The area of the square is: {area}")
print(f"The perimeter of the square is: {perimeter}")