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)

更新于: 2021年10月19日

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