Python Pandas - 将 DateTimeIndex 中的时间戳捕捉到最近发生的频率\n\n


若要将 DateTimeIndex 中的时间戳捕捉到最近发生的频率,请使用 DateTimeIndex.snap() 方法。使用 freq 参数设置频率。

首先,导入所需的库 −

import pandas as pd

使用周期 6 和频率为 D(即天)创建一个 DatetimeIndex −

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

显示 DateTimeIndex −

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

捕捉时间戳到最近发生的频率(此处为月末) −

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

示例

以下是代码 −

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'))

输出

这将生成以下代码 −

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)

更新于: 18-Oct-2021

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