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# 访问器

pandas为一些**特殊的数据类型**提供了多种**Accessors**(访问器), 因此是对**Series**进行操作的方法. 总的来说有以下的方法:

| Data Type                   | Accessor |
| --------------------------- | -------- |
| Datetime, Timedelta, Period | dt       |
| String                      | str      |
| Categorical                 | cat      |
| Sparse                      | sparse   |

除了特殊的数据类型, pandas还提供了**时间窗口**相关的**Accessors**, 对**DataFrame**和**Series**都有效:

* pandas.DataFrame.rolling(), pandas.Series.rolling()
* pandas.DataFrame.expanding(), pandas.Series.expanding()
* pandas.DataFrame.ewm(), pandas.Series.ewm()