Python Pandas - 如何对具有微秒频率的 DateTimeIndex 执行舍入操作
要用微秒频率对 DateTimeIndex 执行舍入操作,请使用 DateTimeIndex.floor() 方法。对于微秒频率,请使用取值为 ‘μs’ 的 freq 参数。
首先,导入所需的库 −
import pandas as pd
DateTimeIndex,频率为秒,周期为 7。时区为澳大利亚/阿德莱德 −
datetimeindex = pd.date_range('2021-10-18 07:20:32.261811624', periods=5, tz='Australia/Adelaide', freq='40S')
微秒频率的 DateTimeIndex 日期上的舍入操作。对于微秒频率,我们使用了 'μs' −
print("\nPerforming floor operation with microseconds frequency...\n", datetimeindex.floor(freq='us'))
示例
以下为代码 −
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 microseconds frequency # For microseconds frequency, we have used 'us' print("\nPerforming floor operation with microseconds frequency...\n", datetimeindex.floor(freq='us'))
输出
将会生成以下代码 −
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 microseconds frequency... DatetimeIndex(['2021-10-18 07:20:32.261811+10:30', '2021-10-18 07:21:12.261811+10:30', '2021-10-18 07:21:52.261811+10:30', '2021-10-18 07:22:32.261811+10:30', '2021-10-18 07:23:12.261811+10:30'], dtype='datetime64[ns, Australia/Adelaide]', freq=None)
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