如何在python中计算前几个月的首日和末日的日期范围

from datetime import datetime
from dateutil.relativedelta import relativedelta

def get_month_range(months):
    today = datetime.today()
    first_day = today.replace(day=1)
    start_date = first_day - relativedelta(months=months)
    end_date = first_day - relativedelta(days=1)
    return start_date, end_date

start_date, end_date = get_month_range(3)
print("起始日期：", start_date.strftime("%Y-%m-%d"))
print("结束日期：", end_date.strftime("%Y-%m-%d"))