Why does this not work?

[Tetsuo]

You know you suck if the calculator you are making isn't required to add
2 and 2, and you still can't get it to work.

s = 0
c = 0
def halfadder(a, b):
    if a and b in (0, 1):
        if a and b == 1:
            s = 1
            c = 0
            print s, c
        elif a and b == 0:
            s = 0
            c = 0
            print s, c
        else:
            s = 0
            c = 1
            print s, c
    else:
        print "Number out of range! Enter 0 or 1, please."

halfadder(1,1)
halfadder(1,0)
halfadder(0,1)
halfadder(0,0)

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