题解 | #截取字符串#

from collections import deque

def read_first_k_items(n,k):
    str_n =list(n)
    queue = deque()
    if k >= 1 and k <= 1000:
       for items in range(0,k):
           queue.append(str_n[items])
       return str(''.join(queue))


if __name__=='__main__':
    n,k = str(input()),int(input())
    print(read_first_k_items(n,k))

将字符串n转化为list，然后遍历前n个元素