Why is everybody saying single-layer perceptron can't solve XOR? What about this?

def activation_function(number):
if number%2:
return 1
return 0

weights = [1, 1]
for x in range(2):
for y in range(2):
print(f"{x}, {y} = {activation_function(weights[0] * x + weights[1] * y)}")

Output:

0, 0 = 0 |
0, 1 = 1 |
1, 0 = 1 |
1, 1 = 0 |

layer neuralnetworks perceptron solve xor