增加元素可用：append insert

语法应用举例

nums = [9,8,7,6,5]
nums.append(4)
nums.insert(2,11)
print(nums)
print(len(nums))

 结果如下：

/usr/local/bin/python3.6 "/Users/muxiuyulin/Desktop/study python/test4.py"
[9, 8, 11, 7, 6, 5, 4]
7

Process finished with exit code 0

列表中插入元素