A single layer neural network to determine AND boolean logic

AND-single-layer-neurone.py

def nn(input1, input2):
    bias    = 1

    weight0 = -1 
    weight1 = 0.5
    weight2 = 0.5

    net = (bias*weight0)+(input1*weight1)+(input2*weight2)

    return "1" if net >= 0 else "0"

print "X | Y | O "
print "0 | 0 | " + nn(0, 0)
print "1 | 0 | " + nn(1, 0)
print "0 | 1 | " + nn(0, 1)
print "1 | 1 | " + nn(1, 1)