ticker.py (bitstamp|btcchina|btce|coinjar|mtgox - USD) http://www.reddit.com/r/Bitcoin/comments/1rn82s/tickerpy_bitstampbtcchinabtcecoinjarmtgox_usd/

ticker.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import datetime
import httplib
import json
import time
import urllib2

def urlopen(url):
    response = None
    request = urllib2.Request(url=url)
    try:
        response = urllib2.urlopen(request).read()
    except urllib2.HTTPError as err:
        print "HTTPError: {} ({})".format(url, err.code)
    except urllib2.URLError as err:
        print "URLError: {} ({})".format(url, err.reason)
    except httplib.BadStatusLine as err:
        print "BadStatusLine: {}".format(url)
    return response

def get_exchange_rate(from_currency="CNY", to_currency="USD"):
    url = "https://finance.yahoo.com/d/quotes.csv?f=sl1&s=%s%s=X" % (
        from_currency, to_currency)
    data = urlopen(url)
    if "%s%s" % (from_currency, to_currency) in data:
        return float(data.strip().split(",")[1])
    return None

urls = {
    'bitstamp': "https://www.bitstamp.net/api/ticker/",
    'btcchina': "https://data.btcchina.com/data/ticker",
    'btce': "https://btc-e.com/api/2/btc_usd/ticker",
    'coinjar': "https://coinjar-data.herokuapp.com/fair_rate.json",
    'mtgox': "https://data.mtgox.com/api/1/BTCUSD/ticker",
}

stat = {}

while True:
    for exchange, url in urls.iteritems():
        json_data = urlopen(url)
        if json_data:
            try:
                data = json.loads(json_data)
            except ValueError as err:
                print "ValueError: {} ({})".format(url, err)
                continue

            if exchange == 'bitstamp':
                last = data['last']
            elif exchange == 'btcchina':
                exchange_rate = get_exchange_rate(from_currency="CNY",
                                                  to_currency="USD")
                last = float(data['ticker']['last']) * exchange_rate
            elif exchange == 'btce':
                last = data['ticker']['last']
            elif exchange == 'coinjar':
                last = data['spot']['USD']
            elif exchange == 'mtgox':
                last = data['return']['last']['value']

            last = float(last)

            trend = ""
            if stat.has_key(exchange):
                if last > stat[exchange]['prev']:
                    trend = "\033[32m" + "up" + "\033[0m"
                elif last < stat[exchange]['prev']:
                    trend = "\033[31m" + "down" + "\033[0m"
                elif last == stat[exchange]['prev']:
                    trend = "\033[33m" + "unch" + "\033[0m"
            else:
                stat[exchange] = {}

            print "\033[37m[%s]\033[0m" % datetime.datetime.now(), "\033[35m%8s\033[0m" % exchange, "%4.08f" % last, trend

            stat[exchange]['prev'] = last

    print "--"
    time.sleep(30)