1.写代码获取数字1234中的十位上和百位上的数字

                     number = 1234
                     a = number // 10 % 10
                     b = number // 100 % 10
                     print(a,b)

如果变量n的值是6784，以一下表达式的结果是多少？

                # n / 1000 % 100
                # n % 1000 / 100
                # n //100 % 10
                # n // 10 % 100 //10
                n = 6784
                t1 = (n / 1000 % 100) = 6.784 
                t2 = (n % 1000 / 100) = 7.84 
                t3 = (n //100 % 10)     = 7 
                t4 = (n // 10 % 100 //10) = 7 

                print(t1,t2,t3,t4)

3.表达式10 / 4 + 23 // 4 * 2 -30的结果是多少？

              number = (10 / 4) + (23 // (4 * 2)) - 30

              print(number) = -25.5

4.写出下面每一行中n3的结果

                 n1 = 4; n2 = 5
                 n3 = n1 > n2
                 n3 = n1 < n2
                 n3 = n1 == 4
                n3 = n1 != 4
                n3 = n1 == 1+3

                print (n1 > n2)    =False
                print(n1 < n2)     =True
                print(n1 == n2)   =False
                print(n1 != n2)    =True
                print(n1 == 1+3)  =True

5.写出以下代码执行完成后，num的结果

                num  = 10
                num /= 2
                num += ((10 * 10) / 4) + (2*(3**2))

                print(num) = 48.0

6.下面定义变量正确的是()

             A. a = b = c = 10
             B. a, c = 10 
             C. in = 20
             D. num = 10; t = 20  
            print("A")