三位数排列

<pre name="code" class="python">print('三位数分别为：')x = '1234'n = 0for i in x:    a = i    for j in x:        if(j == i): continue        a = i + j        for k in x:            if(k == i or k == j): continue            a = i + j + k            print(a)            n += 1print('总数量为：' + str(n))