Python Pandas - 從具有特定時間序列頻率的 DateTimeIndex 中提取星期幾
要從具有特定時間序列頻率的 DateTimeIndex 中提取星期幾,請使用 **DateTimeIndex.dayofweek** 屬性。
首先,匯入所需的庫:
import pandas as pd
建立一個週期為 6,頻率為 D(即天)的 DatetimeIndex:
datetimeindex = pd.date_range('2021-10-20 02:30:50', periods=6, tz='Australia/Sydney', freq='3D')
顯示 DateTimeIndex 頻率:
print("DateTimeIndex frequency...\n", datetimeindex.freq)
獲取星期幾。假設一週從星期一開始,用 0 表示,星期天用 6 表示:
print("\nGet the day of week..\n",datetimeindex.dayofweek)
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/Sydney datetimeindex = pd.date_range('2021-10-20 02:30:50', periods=6, tz='Australia/Sydney', freq='3D') # display DateTimeIndex print("DateTimeIndex...\n", datetimeindex) # display DateTimeIndex frequency print("DateTimeIndex frequency...\n", datetimeindex.freq) # Get the day of week # It is assumed the week starts on Monday, # which is denoted by 0 and ends on Sunday which is denoted by 6 print("\nGet the day of week..\n",datetimeindex.dayofweek)
輸出
這將產生以下程式碼:
DateTimeIndex... DatetimeIndex(['2021-10-20 02:30:50+11:00', '2021-10-23 02:30:50+11:00', '2021-10-26 02:30:50+11:00', '2021-10-29 02:30:50+11:00', '2021-11-01 02:30:50+11:00', '2021-11-04 02:30:50+11:00'], dtype='datetime64[ns, Australia/Sydney]', freq='3D') DateTimeIndex frequency... <3 * Days> Get the day of week.. Int64Index([2, 5, 1, 4, 0, 3], dtype='int64')
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