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标准库collections的deque，是一个双端循环队列,可以限制存储容量

from random import randint
from collections import deque
his = []
his2 = deque([], 5)#限制长度为5
N = randint(0,100)
def guess(k):
    if k == N :
        print("猜正确！")
        return True
    if k > N :
        print("数字猜大了！")
    else:
        print("数字猜小了！")
    return False

while True:
    line = input("input a number:")
    if line.isdigit():
        k = int(line)
        his2.append(k)
        his.append(k)
        if guess(k):
            break

his:[10, 34, 23, 26, 2, 28]
his2:deque([34, 23, 26, 2, 28])#始终为最新的5个数