Serious10#markdown#字符串1

### 字符串的创建 ```python str1 = 'hello' str2 = "world" str3 = """ni hao""" ``` ### 字符串的查询 ```python str1[0:6:2] ``` 'hlo' ### 字符串的删除 ```python ``` ### ```python str2.replace('w','W') ``` 'World' ```python str2.lower() ``` 'world' ```python s