def do_OP_TUCK(stack):
    v1 = stack.pop()
    v2 = stack.pop()
    stack.append(v1)
    stack.append(v2)
    stack.append(v1)
>>> s = [1, 2, 3]
dataset/ETHPy150Open richardkiss/pycoin/pycoin/tx/script/microcode.py/do_OP_TUCK