Function op_not

code-ch08/op.py:441–449

(stack)

def op_not(stack):
    if len(stack) < 1:
        return False
    element = stack.pop()
    if decode_num(element) == 0:
        stack.append(encode_num(1))
    else:
        stack.append(encode_num(0))
    return True


def op_0notequal(stack):