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feat(day07): Day07 学习笔记

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	`1`	`+# Day07 - 字符串和常用数据结构`
	`2`	`+`
	`3`	`+## 字符串`
	`4`	`+`
	`5`	`+### 切片`
	`6`	`+`
	`7`	`+- [廖雪峰 Python 切片](https://www.liaoxuefeng.com/wiki/897692888725344/923029651584288)`
	`8`	`+`
	`9`	+```Python
	`10`	`+str2 = 'abc123456'`
	`11`	`+# 从字符串中取出指定位置的字符(下标运算)`
	`12`	`+print(str2[2]) # c`
	`13`	`+# 字符串切片(从指定的开始索引到指定的结束索引)`
	`14`	`+print(str2[2:5]) # c12`
	`15`	`+print(str2[2:]) # c123456`
	`16`	`+print(str2[2::2]) # c246`
	`17`	`+print(str2[::2]) # ac246`
	`18`	`+print(str2[::-1]) # 654321cba`
	`19`	`+print(str2[-3:-1]) # 45`
	`20`	+```
	`21`	`+`
	`22`	`+## 列表`
	`23`	`+`
	`24`	`+- 排序`
	`25`	+ - `list = sorted(list)` 返回排序后的结果
	`26`	+ - `list.sort()` 直接在列表对象上排序
	`27`	`+- [列表生成式](https://www.liaoxuefeng.com/wiki/897692888725344/923029657876192)`

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