python 获取每个月的月初和月尾 python获取上个月月份

#! /usr/bin/python
# -*- coding: utf-8 -*-
import sys
import time
import datetime
import sys
reload(sys)
sys.setdefaultencoding("utf-8")
def getLastMonth(day = None, months=1):
if day:
today = day
else:
today = datetime.date.today()
y = int(months/12)
m = months%12
if today.month - m <= 0:
y = y + 1
m = 12 + (today.month-m)
nextMonth = today.replace(year=today.year-y, month=m, day=1)
elif m == 0:
nextMonth = today.replace(year=today.year-y, day=1)
else:
nextMonth = today.replace(year=today.year-y, month=today.month-m, day=1)
return nextMonth
d = datetime.date.today()
d=getLastMonth()
print d.strftime("%Y-%m-01")
d = datetime.date.today()
for i in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15):
d=getLastMonth(day = d, months=11)
print d.strftime("%Y-%m-01")
print "............................."
d = datetime.date(2011, 1, 1)
for i in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15):
d=getLastMonth(day = d, months=11)
print d.strftime("%Y-%m-01")