gistfile1.py

import requests
import json
url ="http://www.gretai.org.tw/web/stock/aftertrading/daily_trading_info/st43_result.php?l=zh-tw&d=%s&stkno=3290&_=1421136081459"
dt = "104/1"
from datetime import timedelta
from dateutil.relativedelta import relativedelta

getyear =  dt.split('/',1) 
bctime =  str(int(getyear[0]) + 1911) +"/"+ getyear[1]
for i in range(1,10):
    ts =  (datetime.strptime(bctime, "%Y/%m") - relativedelta(months=i)).strftime("%Y/%m")
    ts2 = ts.split('/',1)
    ts3 = str(int(ts2[0]) - 1911) + '/' + ts2 [1]
    res = requests.get(url %(ts3))
    j = json.loads(res.text)
    for price in j['aaData']:
        print price[0]