Yahoo Finance API in Python 3.2

This is a sample code to fetch market data from yahoo finance.

import urllib.request

class YahooFinance:
    yahoo_tags = {
'a':'Ask',
'b':'Bid',
#'b4':'Book Value',  ##
'c1':'Change',
#'c8':'After Hours Change (Real-time)', ##
'd2':'Trade Date',
#'e7':'EPS Estimate Current Year', ##
#'f6':'Float Shares', ##
'j':'52-week Low',
#'g3':'Annualized Gain', ## 
#'g6':'Holdings Gain (Real-time)',## 
#'j1':'Market Capitalization',##
'j5':'Change From 52-week Low',
#'k2':'Change Percent (Real-time)', ##
'k5':'Percebt Change From 52-week High',
#'l2':'High Limit', ##
#'m2':"Day's Range (Real-time)", ##
#'m5':'Change From 200-day Moving Average', #not required
#'m8':'Percent Change From 50-day Moving Average', #not required
'o':'Open',
'p2':'Change in Percent',
'q':'Ex-Dividend Date',
#'r2':'P/E Ratio (Real-time)', ##
#'r7':'Price/EPS Estimate Next Year', ##
#'s7':'Short Ratio', ##
#'t7':'Ticker Trend', ##
#'v1':'Holdings Value', ##
#'w1':"Day's Value Change", #not required
#'y':'Dividend Yield',##
#'b6':'Bid Size', #-----Bug
#'c3':'Commission',##
#'d':'Dividend/Share',##
#'e':'Earnings/Share',##
#'e8':'EPS Estimate Next Year',##
'g':"Day's Low",
'k':'52-week High',
#'g4':'Holdings Gain', ##
#'i':'More Info',
#'j3':'Market Cap (Real-time)', ##
'j6':'Percent Change From 52-week Low',
'k3':'Last Trade Size',
#'l':'Last Trade (With Time)',
#'l3':'Low Limit',
#'m3':'50-day Moving Average',
#'m6':'Percent Change From 200-day Moving Average',
#'n':'Name', ##
'p':'Previous Close',
#'p5':'Price/Sales',
#'r':'P/E Ratio',
#'r5':'PEG Ratio',
's':'Symbol',
't1':'Last Trade Time',
#'t8':'1 yr Target Price',
#'v7':'Holdings Value (Real-time)',
#'w4':"Day's Value Change (Real-time)",
#'c':'Change & Percent Change',
#'c6':'Change (Real-time)',
'd1':'Last Trade Date',
#'e1':'Error Indication (returned for symbol changed / invalid)',
#'e9':'EPS Estimate Next Quarter',
'h':"Day's High",
#'g1':'Holdings Gain Percent',
#'g5':'Holdings Gain Percent (Real-time)',
#'i5':'Order Book (Real-time)',
#'j4':'EBITDA',
#'k1':'Last Trade (Real-time) With Time',
'k4':'Change From 52-week High',
'l1':'Last Trade (Price Only)',
#'m':"Day's Range",
#'m4':'200-day Moving Average',
#'m7':'Change From 50-day Moving Average',
#'n4':'Notes',
#'p1':'Price Paid',
#'p6':'Price/Book',
#'r1':'Dividend Pay Date',
#'r6':'Price/EPS Estimate Current Year',
#'s1':'Shares Owned',
#'t6':'Trade Links',
'v':'Volume',
#'w':'52-week Range',
'x':'Stock Exchange'
}

    quote_list = ['Ask','Bid','Change','Trade Date','52-week Low',
                  'Change From 52-week Low','Percebt Change From 52-week High',
                  'Open','Change in Percent','Ex-Dividend Date',"Day's Low",
                  '52-week High','Percent Change From 52-week Low','Last Trade Size',
                  'Previous Close','Symbol','Last Trade Time','Last Trade Date',
                  "Day's High",'Change From 52-week High','Last Trade (Price Only)',
                  'Volume','Stock Exchange']

    def __init__(self, symbol, debug_flg = False):
        self.symbol = symbol
        self.req_header = ""
        self.req_value = ""
        self.res_data = []
        self.res_value = []
        self.mkt_data = {}
        self.debug_flg = debug_flg

        for key in YahooFinance.yahoo_tags :
            self.req_header += key + "#|"
            self.req_value += YahooFinance.yahoo_tags[key] + "#|"

        if debug_flg :
            print (self.req_header)
            print (self.req_value)
        
    def request(self):
        header = "".join(self.req_header.split("#|"))
        url = 'http://finance.yahoo.com/d/quotes.csv?s=%s&f=%s' % (self.symbol,header)
        return str(urllib.request.urlopen(url).read(), encoding='utf8')

    def process(self):
        self.res_data = self.request().split(',')
        self.res_value = self.req_value.split("#|")
        self.mkt_data = dict(zip(self.res_value, self.res_data))

        #for k in mkt_data:
        #    print (k, "=>", mkt_data[k])

    def show(self):
        if len(self.mkt_data) == 0:
            print ("Error ...data is not fetched")
        else:
            for k in YahooFinance.quote_list:
                print (k, " => ", self.mkt_data[k])
        
 

ab = YahooFinance('HINDALCO.NS')
ab.process()
ab.show()

Output :-

Unsorted :
Ask  =>  117.25
Bid  =>  116.25
Change  =>  -3.60
Trade Date  =>  -
52-week Low  =>  111.20
Change From 52-week Low  =>  +5.05
Percebt Change From 52-week High  =>  -48.28%
Open  =>  120.65
Change in Percent  =>  "-3.00%"
Ex-Dividend Date  =>  "14-Sep-11"
Day's Low  =>  115.55
52-week High  =>  224.75
Percent Change From 52-week Low  =>  +4.54%
Last Trade Size  =>  1
Previous Close  =>  119.85
Symbol  =>  "HINDALCO.NS"
Last Trade Time  =>  "6:29am"
Last Trade Date  =>  "4/26/2012"
Day's High  =>  121.15
Change From 52-week High  =>  -108.50
Last Trade (Price Only)  =>  116.25
Volume  =>  10257747
Stock Exchange  =>  "NSE"