Python Pandas - 如何对具有毫秒频率的 DateTimeIndex 执行地板运算
若要对具有毫秒频率的 DateTimeIndex 执行地板运算,请使用 DateTimeIndex.floor() 方法。对于毫秒频率,请使用具有值 'ms' 的 freq 参数。
首先,导入所需的库 -
import pandas as pd
带有周期 7 和频率为 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)
具有毫秒频率的 DateTimeIndex 日期上的地板运算。对于毫秒频率,我们使用了 'ms' -
print("\nPerforming floor operation with milliseconds frequency...\n", datetimeindex.floor(freq='ms'))
示例
以下是代码 -
import pandas as pd # DatetimeIndex with period 7 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) # Floor operation on DateTimeIndex date with milliseconds frequency # For milliseconds frequency, we have used 'ms' print("\nPerforming floor operation with milliseconds frequency...\n", datetimeindex.floor(freq='ms'))
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> Performing floor operation with milliseconds frequency... DatetimeIndex(['2021-10-18 07:20:32.261000+10:30', '2021-10-18 07:21:12.261000+10:30', '2021-10-18 07:21:52.261000+10:30', '2021-10-18 07:22:32.261000+10:30', '2021-10-18 07:23:12.261000+10:30'], dtype='datetime64[ns, Australia/Adelaide]', freq=None)
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