如何从pandas数据框中查找最近24小时的数据

Question

我有一个数据，其中有两列，一列是描述，另一列是发布位置。我在publishedAt列上应用了排序函数并获得了日期降序排列的输出。这是我的数据框的示例：

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        description publishedAt\n13  Bitcoin price has failed to secure momentum in...   2018-05-06T15:22:22Z\n16  Brian Kelly, a long-time contributor to CNBC\xe2\x80\x99s...   2018-05-05T15:56:48Z\n2   The bitcoin price is less than $100 away from ...   2018-05-05T13:14:45Z\n12  Mati Greenspan, a senior analyst at eToro and ...   2018-05-04T16:05:37Z\n52  A Singaporean startup developing \xe2\x80\x98smart bankno...   2018-05-04T14:02:30Z\n75  Cryptocurrencies are set to make a comeback on...   2018-05-03T08:10:19Z\n76  The bitcoin price is hovering near its best le...   2018-04-30T16:26:57Z\n74  In today\xe2\x80\x99s climate of ICOs with 100 billion to...   2018-04-30T12:03:31Z\n27  Investment guru Warren Buffet remains unsold o...   2018-04-29T17:22:19Z\n22  The bitcoin price has increased by around $400...   2018-04-28T12:28:35Z\n68  Bitcoin futures volume reached an all-time hig...   2018-04-27T16:32:44Z\n14  Biotech-company-turned-cryptocurrency-investme...   2018-04-27T14:25:15Z\n67  The bitcoin price has rebounded to $9,200 afte...   2018-04-27T06:24:42Z\n

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现在我想描述过去 3 小时、6 小时、12 小时和 24 小时。\n我怎样才能找到它？

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谢谢

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Answer 1

作为 Pandas 中的一个简单解决方案，您可以使用该DataFrame.last(offset)函数。请务必将 PublishedAt 列设置为数据框 DateTimeIndex。一个类似的函数是获取数据帧开头的行DataFrame.first(offset)。

这是使用提供的偏移量的示例：

df.last('24h')
df.last('12h')
df.last('6h')
df.last('3h')