Python Pandas - 如何对小时频率的 DateTimeIndex 进行取整运算


若要对小时频率的 DateTimeIndex 执行取整运算,请使用 DateTimeIndex.floor() 方法。对于小时频率,请将 freq 参数与值 ‘H’ 结合使用。

首先,导入需要的库 −

import pandas as pd

使用周期为 5、频率为分钟(即分)创建 DateTimeIndex −

datetimeindex = pd.date_range('2021-09-29 07:20:32.261811624', periods=5,
tz='Australia/Adelaide', freq='20min')

显示 DateTimeIndex −

print("DateTimeIndex...\n", datetimeindex)

使用小时频率对 DateTimeIndex 日期执行取整运算时,对于小时频率,我们使用了 'H' −

print("\nPerforming floor operation with hourly frequency...\n",
datetimeindex.floor(freq='H'))

示例

代码如下 −

import pandas as pd

# DatetimeIndex with period 5 and frequency as min i.e. minutes
# timezone is Australia/Adelaide
datetimeindex = pd.date_range('2021-09-29 07:20:32.261811624', periods=5,
tz='Australia/Adelaide', freq='20min')

# display DateTimeIndex
print("DateTimeIndex...\n", datetimeindex)

# display DateTimeIndex frequency
print("DateTimeIndex frequency...\n", datetimeindex.freq)

# Floor operation on DateTimeIndex date with hourly frequency
# For hourly frequency, we have used 'H'
print("\nPerforming floor operation with hourly frequency...\n",
datetimeindex.floor(freq='H'))

输出

这将生成以下代码 −

DateTimeIndex...
DatetimeIndex(['2021-09-29 07:20:32.261811624+09:30',
'2021-09-29 07:40:32.261811624+09:30',
'2021-09-29 08:00:32.261811624+09:30',
'2021-09-29 08:20:32.261811624+09:30',
'2021-09-29 08:40:32.261811624+09:30'],
dtype='datetime64[ns, Australia/Adelaide]', freq='20T')
DateTimeIndex frequency...
<20 * Minutes>

Performing floor operation with hourly frequency...
DatetimeIndex(['2021-09-29 07:00:00+09:30', '2021-09-29 07:00:00+09:30',
'2021-09-29 08:00:00+09:30', '2021-09-29 08:00:00+09:30',
'2021-09-29 08:00:00+09:30'],
dtype='datetime64[ns, Australia/Adelaide]', freq=None)

更新于:2021 年 10 月 19 日

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