使用python自己写了一个固定长度的list

1、直接上代码（固定 长度为10的list，长度可以自己更改）

b = range(10,30,1)      #生成一个10~30的list
a = []                  #定义一个空列表

for i in b:    
    if len(a) == 10:    #这里的10为你想要固定长度list的长度
        a.pop(0)        #删除list a 中的第一个元素
        a.append(i)     #添加list a 中的最后一个元素
    else:
        a.append(i)
    print(a)            #打印结果

2、直接上运行结果

[10]
[10, 11]
[10, 11, 12]
[10, 11, 12, 13]
[10, 11, 12, 13, 14]
[10, 11, 12, 13, 14, 15]
[10, 11, 12, 13, 14, 15, 16]
[10, 11, 12, 13, 14, 15, 16, 17]
[10, 11, 12, 13, 14, 15, 16, 17, 18]
[10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
[11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
[12, 13, 14, 15, 16, 17, 18, 19, 20, 21]
[13, 14, 15, 16, 17, 18, 19, 20, 21, 22]
[14, 15, 16, 17, 18, 19, 20, 21, 22, 23]
[15, 16, 17, 18, 19, 20, 21, 22, 23, 24]
[16, 17, 18, 19, 20, 21, 22, 23, 24, 25]
[17, 18, 19, 20, 21, 22, 23, 24, 25, 26]
[18, 19, 20, 21, 22, 23, 24, 25, 26, 27]
[19, 20, 21, 22, 23, 24, 25, 26, 27, 28]
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29]