Python Pandas - 將 DateTimeIndex 中的時間戳捕捉到最近發生的頻率\n\n


若要將 DateTimeIndex 中的時間戳捕捉到最近發生的頻率,請使用 DateTimeIndex.snap() 方法。使用 freq 引數設定頻率。

首先,匯入所需的庫 −

import pandas as pd

使用週期 6 和頻率為 D(即天)建立一個 DatetimeIndex −

datetimeindex = pd.date_range('2021-10-20 02:30:50', periods=6, tz='Australia/Adelaide', freq='D')

顯示 DateTimeIndex −

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

捕捉時間戳到最近發生的頻率(此處為月末) −

print("\nSnap time stamps to nearest occurring frequency...\n",
datetimeindex.snap(freq='M'))

示例

以下是程式碼 −

import pandas as pd

# DatetimeIndex with period 6 and frequency as D i.e. day
# The timezone is Australia/Adelaide
datetimeindex = pd.date_range('2021-10-20 02:30:50', periods=6, tz='Australia/Adelaide', freq='D')

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

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

# Snap time stamps to nearest occurring i.e. Month end here
print("\nSnap time stamps to nearest occurring frequency...\n",
datetimeindex.snap(freq='M'))

輸出

這將生成以下程式碼 −

DateTimeIndex...
DatetimeIndex(['2021-10-20 02:30:50+10:30', '2021-10-21 02:30:50+10:30',
'2021-10-22 02:30:50+10:30', '2021-10-23 02:30:50+10:30',
'2021-10-24 02:30:50+10:30', '2021-10-25 02:30:50+10:30'],
dtype='datetime64[ns, Australia/Adelaide]', freq='D')
DateTimeIndex frequency...
<Day>

Snap time stamps to nearest occurring frequency...
DatetimeIndex(['2021-10-31 02:30:50+10:30', '2021-10-31 02:30:50+10:30',
'2021-10-31 02:30:50+10:30', '2021-10-31 02:30:50+10:30',
'2021-10-31 02:30:50+10:30', '2021-10-31 02:30:50+10:30'],
dtype='datetime64[ns, Australia/Adelaide]', freq=None)

更新於: 18-Oct-2021

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