Python Pandas - 如何对以秒为频率的 DateTimeIndex 执行向上取整操作
要对以秒为频率的 DateTimeIndex 执行向上取整操作,可以使用 **DateTimeIndex.ceil()** 方法。对于秒频率,使用 **freq** 参数,其值为 **‘S’**。
首先,导入所需的库 -
import pandas as pd
创建一个周期为 5 且频率为 S(即秒)的 DatetimeIndex -
datetimeindex = pd.date_range('2021-10-18 07:20:32.261811624', periods=5, tz='Australia/Adelaide', freq='40S')
显示 DateTimeIndex -
print("DateTimeIndex...\n", datetimeindex)
对 DateTimeIndex 日期执行以秒为频率的向上取整操作。对于秒频率,我们使用了 'S' -
print("\nPerforming ceil operation with seconds frequency...\n", datetimeindex.ceil(freq='S'))
示例
以下是代码 -
import pandas as pd # DatetimeIndex with period 5 and frequency as S i.e. seconds # timezone is Australia/Adelaide datetimeindex = pd.date_range('2021-10-18 07:20:32.261811624', periods=5, tz='Australia/Adelaide', freq='40S') # display DateTimeIndex print("DateTimeIndex...\n", datetimeindex) # display DateTimeIndex frequency print("DateTimeIndex frequency...\n", datetimeindex.freq) # getting the second res = datetimeindex.second # display only the second print("\nThe second from DateTimeIndex...\n", res) # Ceil operation on DateTimeIndex date with seconds frequency # For seconds frequency, we have used 'S' print("\nPerforming ceil operation with seconds frequency...\n", datetimeindex.ceil(freq='S'))
输出
这将生成以下代码 -
DateTimeIndex... DatetimeIndex(['2021-10-18 07:20:32.261811624+10:30', '2021-10-18 07:21:12.261811624+10:30', '2021-10-18 07:21:52.261811624+10:30', '2021-10-18 07:22:32.261811624+10:30', '2021-10-18 07:23:12.261811624+10:30'], dtype='datetime64[ns, Australia/Adelaide]', freq='40S') DateTimeIndex frequency... <40 * Seconds> The second from DateTimeIndex... Int64Index([32, 12, 52, 32, 12], dtype='int64') Performing ceil operation with seconds frequency... DatetimeIndex(['2021-10-18 07:20:33+10:30', '2021-10-18 07:21:13+10:30', '2021-10-18 07:21:53+10:30', '2021-10-18 07:22:33+10:30', '2021-10-18 07:23:13+10:30'], dtype='datetime64[ns, Australia/Adelaide]', freq=None)
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