list切片 

 1 切片就是list范围取值的一种方式
 2 
 3 取头不取尾
 4 
 5 如：
 6 
 7 li = list(range(0,11))
 8 
 9 # title = "A man, a plan, a canal: Panama"
10 # a= ''.join(title)
11 # c = a.lower()
12 # print(c)
13 
14 s = "A man, a plan, a canal: Panama"
15 s_list = []
16 for i in s:
17     if i.isalnum():
18         s_list.append(i)
19 # print("s_list",s_list)
20 new_s = ''.join(s_list)
21 new_s = new_s.lower()
22 # print('new_s',new_s)
23 if new_s == new_s[::-1]:
24     print("是回文")
25 else:
26     print("不是回文")
27 
28 
29 # a = [2,2,3]
30 # for i in a:
31 #     if a.count(i) == 1:
32 #         print(i)
33 #         break

 

posted @ 2021-05-13 17:38  等待iing  阅读(242)  评论(0)    收藏  举报