如何在python中获取当前月份的上周四日期或周三日期答案

【问题标题】：How to get last Thursday date or Wednesday date of current month in python如何在python中获取当前月份的上周四日期或周三日期
【发布时间】：2022-01-19 09:00:29
【问题描述】：

我有一个数据框，其中有日期。我想从nf_date 列中获取每个日期，如果nf_date 列中不存在上周四日期，则获取该月的上周四当前数据框中的日期在新列名expirymy code is pasted in this link

【问题讨论】：

标签： python-3.x pandas dataframe datetime timedelta

【解决方案1】：

您可以从当月的结束日期返回获取具体的工作日：

import pandas as pd

# a dummy example
df = pd.DataFrame({'date': ['2021-10-29', '2021-11-01', '2021-12-16']})
#       month last Thursday: 2021-10-28,   2021-11-25,   2021-12-30

# we have a datetime series in our dataframe...
df['date'] = pd.to_datetime(df['date'])

# we can easily get the month's end date:
df['mEnd'] = df['date'] + pd.tseries.offsets.MonthEnd(1)

# Thursday is weekday 3, so the offset for given weekday is
offset = (df['mEnd'].dt.weekday - 3) % 7

# now to get the date of the last Thursday of the month, subtract it from 
# month end date:
df['last_Thrs'] = df['mEnd'] - pd.to_timedelta(offset, unit='D')

print(df)
#         date       mEnd  last_Thrs
# 0 2021-10-29 2021-10-31 2021-10-28
# 1 2021-11-01 2021-11-30 2021-11-25
# 2 2021-12-16 2021-12-31 2021-12-30

【讨论】：