如何在python中获取过去四个月的第一个和最后一个日期

import datetime

current_date = datetime.date.today()

current_year = current_date.year
current_month = current_date.month

if current_month > 4:
    past_year = current_year
    past_month = current_month - 4
else:
    past_year = current_year - 1
    past_month = current_month + 8

past_first_date = datetime.date(past_year, past_month, 1)

import calendar

_, last_day = calendar.monthrange(past_year, past_month)
past_last_date = datetime.date(past_year, past_month, last_day)

import datetime
import calendar

current_date = datetime.date.today()
current_year = current_date.year
current_month = current_date.month

if current_month > 4:
    past_year = current_year
    past_month = current_month - 4
else:
    past_year = current_year - 1
    past_month = current_month + 8

past_first_date = datetime.date(past_year, past_month, 1)
_, last_day = calendar.monthrange(past_year, past_month)
past_last_date = datetime.date(past_year, past_month, last_day)

print("过去四个月的第一个日期：", past_first_date)
print("过去四个月的最后一个日期：", past_last_date)