如何跨年份的变化查找下个月和前几个月

import datetime

# 获取当前日期和时间
now = datetime.datetime.now()

# 计算下个月的日期
next_month = now.replace(month=now.month + 1)
if next_month.month == 1:
    next_month = next_month.replace(year=next_month.year + 1)

# 计算前几个月的日期
previous_months = []
for i in range(1, 4):
    previous_month = now.replace(month=now.month - i)
    if previous_month.month > now.month:
        previous_month = previous_month.replace(year=previous_month.year - 1)
    previous_months.append(previous_month)

# 格式化日期
next_month_str = next_month.strftime("%Y-%m-%d")
previous_months_str = [month.strftime("%Y-%m-%d") for month in previous_months]

# 打印结果
print("下个月的日期：", next_month_str)
print("前几个月的日期：", previous_months_str)