Yahoo! Historical Stock Prices Crawler. Downloads historical prices of stocks. Ticker lists is available from http://www.nasdaq.com/screening/company-list.aspx

yahoo_historical_prices.py

#!/usr/bin/python
import urllib2
import datetime
from os.path import isfile, join
from os import getcwd

tFile = open("tickers.txt")

eYear = datetime.datetime.now().year
eMonth = datetime.datetime.now().month
eDay = datetime.datetime.now().day

for ticker in tFile:
	ticker = ticker.strip()
	if (isfile(join(getcwd(), ticker + ".csv"))):
		continue
  
	print join(getcwd(), ticker + ".csv")

	url = "http://ichart.finance.yahoo.com/table.csv?s={0}&d={1}&e={2}&f={3}&g=d&a=1&b=1&c=1900&ignore=.csv".format(ticker, eMonth, eYear, eDay)
	print "downloading data for ", ticker, "...", 
	try:
		response = urllib2.urlopen(url)
		data = response.read()
		with open(ticker + ".csv", "w") as tData:
			tData.write(data)
			print " done."

	except Exception as ex:
		print " error occurred. " , ex, "."