code: def weekday_series(self, start, end, weekday):
          
          startdatetime = self.parse_datetime(start)
          enddatetime = self.parse_datetime(end)
          
          series = list()
          for i in self.dtime_range(startdatetime, enddatetime, freq="1day"):
              if i.isoweekday() == weekday:
                  series.append(i)
                  
          return series
docs: Generate a datetime series with same weekday number.
          
          ISO weekday number: Mon = 1, Sun = 7
          
          Usage::
          
              >>> timewrapper.weekday_series( # All Tuesday
              >>>     "2014-01-01 06:30:25", "2014-02-01 06:30:25", weekday=2),
              [
                  datetime(2014, 1, 7, 6, 30, 25), 
                  datetime(2014, 1, 14, 6, 30, 25),
                  datetime(2014, 1, 21, 6, 30, 25),
                  datetime(2014, 1, 28, 6, 30, 25),
              ]
          
          **中文文档**
          
          生成星期数一致的时间序列。