Python Pandas - 如何对具有毫秒频率的 DateTimeIndex 执行向上取整运算


要对具有毫秒频率的 DateTimeIndex 执行向上取整运算,请使用 **DateTimeIndex.ceil()** 方法。对于毫秒频率,请使用值为 **‘ms’** 的 **freq** 参数。

首先,导入所需的库:

import pandas as pd

创建一个具有 5 个周期且频率为 S(即秒)的 DatetimeIndex。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')

对 DateTimeIndex 日期执行具有毫秒频率的向上取整运算。对于毫秒频率,我们使用了 'ms':

print("\nPerforming ceil operation with milliseconds frequency...\n",
datetimeindex.ceil(freq='ms'))

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)

# Ceil operation on DateTimeIndex date with milliseconds frequency
# For milliseconds frequency, we have used 'ms'
print("\nPerforming ceil operation with milliseconds frequency...\n",
datetimeindex.ceil(freq='ms'))

输出

这将产生以下代码:

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 ceil operation with milliseconds frequency...
DatetimeIndex(['2021-10-18 07:20:32.262000+10:30',
'2021-10-18 07:21:12.262000+10:30',
'2021-10-18 07:21:52.262000+10:30',
'2021-10-18 07:22:32.262000+10:30',
'2021-10-18 07:23:12.262000+10:30'],
dtype='datetime64[ns, Australia/Adelaide]', freq=None)

更新于:2021年10月19日

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