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字符串处理
对字符串做切片，用方法清理和转换文本，做拆分与连接，并用 f-string 把值格式化成新字符串。
1. Overview
Overview
2. Strings Are Sequences
Strings Are Sequences
3. Cleaning and Transforming Text
Cleaning and Transforming Text
4. Splitting and Joining
Splitting and Joining
5. Formatting with f-Strings
Formatting with f-Strings
6. Searching and Testing Text
Searching and Testing Text
7. Normalize a Header
Normalize a Header
8. Temperature Report
Temperature Report