November 2023
Intermediate to advanced
512 pages
11h 53m
Chinese
Content preview from 利用 Python 进行数据分析：原书第 3 版
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由于周期指的是非重叠时间段，因此对于给定的频率，一个时间戳只能属于一个周期。
新 PeriodIndex 的频率默认是从时间戳推断而来的，你也可以指定任何支持的频率（支
持表
11-4
中列出的大部分频率）。结果中允许存在重复周期：
要转换回时间戳，使用 to_timestamp 即可，返回的是 DatetimeIndex：
时间序列
|
359
11.5.4
通过数组创建
PeriodIndex
固定频率的数据集通常会将时间信息分开存放在多个列中。例如，在下面这个宏观经济
数据集中，年度数据集和季度数据集就分别存放在不同的列中：
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