stock.moving_average(3) 出现index of range

[Simon99]

File "grsTry.py", line 8, in
print stock.moving_average(3) # 閮?鈭???蝥予??
File "C:\Python27\lib\site-packages\grs\fetch_data.py", line 334, in moving_average
return self.__calculate_moving_average(date, 6)
File "C:\Python27\lib\site-packages\grs\fetch_data.py", line 298, in __calculate_moving_average
cal_data = self.__serial_price(row)
File "C:\Python27\lib\site-packages\grs\fetch_data.py", line 290, in __serial_price
return list(result)
File "C:\Python27\lib\site-packages\grs\fetch_data.py", line 289, in
result = (float(i[rows]) for i in self.__raw_data)
IndexError: list index out of range