#!/usr/bin/env python  # -*- coding:utf-8 -*-  import datetime  import collections  def date_list_fun(starttime,endtime):      '''计算输入的起始日期和结束日期之间的所有日期'''      _u=datetime.timedelta(days=1)      startdate=datetime.datetime.strptime(starttime,'%Y%m%d')      enddate=datetime.datetime.strptime(endtime,'%Y%m%d')      n=0      date_list=[]      if  startdate<=enddate:          # print startdate,enddate          while 1:              _time=startdate+n*_u              date_list.append(_time.strftime('%Y%m%d'))              n=n+1              if _time==enddate:                  break      return date_list  def allweeks(year):      '''计算一年内所有周的具体日期,从1月1号开始，12.31号结束      输出如{1: ['20190101','20190106'],...} 只有六天      '''      start_date=datetime.datetime.strptime(str(year)+'0101','%Y%m%d')      end_date=datetime.datetime.strptime(str(year)+'1231','%Y%m%d')      _u=datetime.timedelta(days=1)      n=0      week_date={}      while 1:          _time=start_date+n*_u          w=str(int(_time.strftime('%W'))+1)          week_date.setdefault(w,[]).append(_time.strftime('%Y%m%d'))          n=n+1          if _time==end_date:              break      week_date_start_end={}      for i in week_date:         week_date_start_end[i]=[week_date[i][0],week_date[i][-1]]      print   week_date      print week_date_start_end      return week_date     def all_weeks(year):      '''计算一年内所有周的具体日期,每周都是7天，可能最后一周到 下年       week_date 输出如{1: ['20181231', '20190101', '20190102', '20190103', '20190104', '20190105', '20190106'],...}       计算一年内所有周的起始日期       week_date_start_end {1: ['20181231','20190106'],...}       '''         start_date=datetime.datetime.strptime(str(int(year)-1)+'1224','%Y%m%d')      end_date=datetime.datetime.strptime(str(int(year)+1)+'0107','%Y%m%d')      _u=datetime.timedelta(days=1)      n=0      week_date={}      while 1:          _time=start_date+n*_u          y,w=_time.isocalendar()[:2]          if y==year :              week_date.setdefault(w,[]).append(_time.strftime('%Y%m%d'))          n=n+1          if _time==end_date:              break      week_date_start_end={}      for i in week_date:         week_date_start_end[i]=[week_date[i][0],week_date[i][-1]]      print   week_date      # print week_date_start_end      return week_date,week_date_start_end