Python Pandas - 判断DateTimeIndex中的日期是否为当月第一天
要检查DateTimeIndex中的日期是否为当月第一天,可以使用**DateTimeIndex.is_month_start**属性。
首先,导入所需的库:
import pandas as pd
创建一个周期为6,频率为D(即天)的DatetimeIndex。时区为澳大利亚/阿德莱德:
datetimeindex = pd.date_range('2021-9-21 02:30:50', periods=6, tz='Australia/Adelaide', freq='5D')
显示DateTimeIndex:
print("DateTimeIndex...\n", datetimeindex)
检查DateTimeIndex中的日期是否为当月第一天:
print("\nCheck whether the date in DateTimeIndex is the first day of the month...\n", datetimeindex.is_month_start)
示例
以下是代码:
import pandas as pd # DatetimeIndex with period 6 and frequency as D i.e. days # The timezone is Australia/Adelaide datetimeindex = pd.date_range('2021-9-21 02:30:50', periods=6, tz='Australia/Adelaide', freq='5D') # display DateTimeIndex print("DateTimeIndex...\n", datetimeindex) # display DateTimeIndex frequency print("DateTimeIndex frequency...\n", datetimeindex.freq) # Check whether the date in DateTimeIndex is the first day of the month print("\nCheck whether the date in DateTimeIndex is the first day of the month...\n", datetimeindex.is_month_start)
输出
这将产生以下代码:
DateTimeIndex... DatetimeIndex(['2021-09-21 02:30:50+09:30', '2021-09-26 02:30:50+09:30', '2021-10-01 02:30:50+09:30', '2021-10-06 02:30:50+10:30', '2021-10-11 02:30:50+10:30', '2021-10-16 02:30:50+10:30'], dtype='datetime64[ns, Australia/Adelaide]', freq='5D') DateTimeIndex frequency... <5 * Days> Check whether the date in DateTimeIndex is the first day of the month... [False False True False False False]
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