Python Pandas - 如何對具有秒頻率的 DateTimeIndex 執行向下取整操作


要對具有秒頻率的 DateTimeIndex 執行向下取整操作,請使用 **DateTimeIndex.floor()** 方法。對於秒頻率,請使用 **freq** 引數,其值為 **‘S’**

首先,匯入所需的庫 -

import pandas as pd

建立一個週期為 7 且頻率為 S(即秒)的 DatetimeIndex -

datetimeindex = pd.date_range('2021-10-18 07:20:32.261811624', periods=5,
tz='Australia/Adelaide', freq='40S')

顯示 DateTimeIndex -

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

對 DateTimeIndex 日期執行具有秒頻率的向下取整操作。對於秒頻率,我們使用了 'S' -

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

示例

以下是程式碼 -

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)

# getting the second
res = datetimeindex.second

# display only the second
print("\nThe seconds from DateTimeIndex...\n", res)

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

輸出

這將生成以下程式碼 -

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 seconds from DateTimeIndex...
Int64Index([32, 12, 52, 32, 12], dtype='int64')

Performing floor operation with seconds frequency...
DatetimeIndex(['2021-10-18 07:20:32+10:30', '2021-10-18 07:21:12+10:30',
'2021-10-18 07:21:52+10:30', '2021-10-18 07:22:32+10:30',
'2021-10-18 07:23:12+10:30'],
dtype='datetime64[ns, Australia/Adelaide]', freq=None)

更新於: 2021年10月19日

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