Python Pandas - 创建 PeriodIndex 并获取星期几
要创建一个 PeriodIndex,请使用 pandas.PeriodIndex() 方法。使用 PeriodIndex.dayofweek 属性获取星期几。
首先,导入必要的库 −
import pandas as pd
创建一个 PeriodIndex 对象。PeriodIndex 是一个不可变的 ndarray,其中包含表示时间中规则周期的序数值。我们使用 "freq" 参数设置了频率 −
periodIndex = pd.PeriodIndex(['2018-07-25', '2019-10-30', '2020-11-20', '2021-09-15', '2022-03-12', '2023-06-18'], freq="D")
显示 PeriodIndex 对象 −
print("PeriodIndex...\n", periodIndex)
从 PeriodIndex 对象显示星期几。星期几显示为星期一 = 0,星期二 = 1 ... 星期天 = 6 −
print("\nDays of the week from the PeriodIndex...\n", periodIndex.dayofweek)
示例
以下是代码 −
import pandas as pd # Create a PeriodIndex object # PeriodIndex is an immutable ndarray holding ordinal values indicating regular periods in time # We have set the frequency using the "freq" parameter periodIndex = pd.PeriodIndex(['2018-07-25', '2019-10-30', '2020-11-20', '2021-09-15', '2022-03-12', '2023-06-18'], freq="D") # Display PeriodIndex object print("PeriodIndex...\n", periodIndex) # Display PeriodIndex frequency print("\nPeriodIndex frequency...\n", periodIndex.freq) # Display day from the PeriodIndex object print("\nThe number of days from the PeriodIndex...\n", periodIndex.day) # Display day of the week from the PeriodIndex object # Days of week are displayed as Monday=0, Tuesday=1 ... Sunday=6 print("\nDays of the week from the PeriodIndex...\n", periodIndex.dayofweek)
输出
这将生成以下代码 −
PeriodIndex... PeriodIndex(['2018-07-25', '2019-10-30', '2020-11-20', '2021-09-15', '2022-03-12', '2023-06-18'], dtype='period[D]') PeriodIndex frequency... <Day> The number of days from the PeriodIndex... Int64Index([25, 30, 20, 15, 12, 18], dtype='int64') Days of the week from the PeriodIndex... Int64Index([2, 2, 4, 2, 5, 6], dtype='int64')
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