Python:循环和字符串

Question

Given two strings s1 and s2 of same length.

Create a new string consisting of the last character of s1 followed by the last character of s2, followed by the second to last character of s1, followed by the second to last character of s2, and so on (in other words the new string should consist of alternating characters of the reverse of s1 and s2).

For example,

if s1="hello" and s2="world", then s3 should be "odlllreohw".

我已经尝试过这个:

s3 = '' 
for i in range(0, min(len(s1), len(s2))):
    s3 = s3 + s1[i] + s2[i]

但我不知道如何让它反转 s1 和 s2 中的字母。

Answer 1

在Python中，您可以通过使用负值从末尾偏移来访问字符串或列表。例如:

s3 = s3 + s1[-1] + s2[-2]

将检索 s1 的最后一个字符和 s2 的倒数第二个字符。