python3 获取上个月、前几月、当前月的时间

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

#!/usr/bin/env python # -*- coding: utf-8 -*-   import calendar from datetime import datetime from dateutil.relativedelta import relativedelta   # 获取当前月 def get_cur_month():     return datetime.now().strftime("%Y-%m")   # 获取前几个月 def get_last_month(number=1):     month_date = datetime.now().date() - relativedelta(months=number)     return month_date.strftime("%Y-%m")   #获取上一个月的第一天,1号的0点0分0秒 def get_last_month_start(month_str=None):     if not month_str:         month_str = datetime.now().strftime('%Y-%m')     year, month = int(month_str.split('-')[0]), int(month_str.split('-')[1])     if month == 1:         year -= 1         month = 12     else:         month -= 1     return '{}-{}-01 00:00:00'.format(year, month)   # 获取上一个月的最后一天的23点59分59秒 def get_last_month_end(month_str=None):     if not month_str:         month_str = datetime.now().strftime('%Y-%m')     year, month = int(month_str.split('-')[0]), int(month_str.split('-')[1])     if month == 1:         year -= 1         month = 12     else:         month -= 1     end = calendar.monthrange(year, month)[1]     return '{}-{}-{} 23:59:59'.format(year, month, end)