正确代码

def sumNumber(integer_num):
    print("   i     ||       m(i)")
    print("-"*30)
    a = 0
    for i in range(1, integer_num + 1):
        a += i / (i + 1)
        print("{:4d}     ||     {:.4f}".format(i, a))


sumNumber(20)

结果如下