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'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)

更新日期:2021 年 10 月 19 日

282 次浏览

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