python 输出上个月的月末日期实例

import dateutil
def before_month_lastday(ti):
  today=dateutil.parser.parse(str(ti))
  first = datetime.date(day=1, month=today.month, year=today.year)
  lastMonth = first - datetime.timedelta(days=1)
  cc=str(lastMonth.year)+str(lastMonth.month)+str(lastMonth.day)
  return int(cc)
print(before_month_lastday(20171011))

2017930