重温经典递归：汉诺塔

def move(n,x,z):
    print "%d:%s--->%s" %(n, x, z)

def hanoi(n, x, y, z):
    if n == 1:
        move(n, x, z)
    else:
        hanoi(n-1, x, z, y)
        move(n, x, z)
        hanoi(n-1, y, x, z)


hanoi(10, "x", "y", "z")def move(n,x,z):
    print "%d:%s--->%s" %(n, x