# 344.反转字符串

![在这里插入图片描述](https://img-blog.csdnimg.cn/20190116163903451.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2phY2tpZV9vMm8y,size_16,color_FFFFFF,t_70)

![在这里插入图片描述](https://img-blog.csdnimg.cn/20190116164517951.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2phY2tpZV9vMm8y,size_16,color_FFFFFF,t_70)

1.列表切片:\[1:5:2]取出从0到4的元素，步长为2，当步长为负数就是从后向前取，相当于反转。

2.语法： 'sep'.join(seq)

参数说明\
sep：分隔符。可以为空\
seq：要连接的元素序列、字符串、元组、字典\
上面的语法即：以sep作为分隔符，将seq所有的元素合并成一个新的字符串

返回值：返回一个以分隔符sep连接各个元素后生成的字符串


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://qiangrens-organization.gitbook.io/qkd90/java-kai-fa/suan-fa-ti-mu/leetcode-zi-xuan-ce-shi-ti/344.-fan-zhuan-zi-fu-chuan.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.