'''

download last three year history data

'''

from pyalgotrade.tools import yahoofinance

from pyalgotrade.utils import dt

import threadpool

import pandas as pd

import datetime

#nasdaq

nasdaq_df = pd.read_csv("data/nasdaq.csv")

nasdaq_df = nasdaq_df[nasdaq_df.Industry != 'n/a']

#amex

amex_df = pd.read_csv("data/amex.csv")

amex_df = amex_df[amex_df.Industry != 'n/a']

#ntse

nyse_df = pd.read_csv("data/nyse.csv")

nyse_df = nyse_df[nyse_df.Industry != 'n/a']

now = datetime.datetime.now()

year = now.year

begin = dt.get_first_monday(year-3)

end = dt.get_last_monday(year) + datetime.timedelta(days=6)

data = nasdaq_df['Symbol'].tolist() + amex_df['Symbol'].tolist() + nyse_df['Symbol'].tolist()

def callback(request, result):

f.close()

def run(symbol):

pass

n = 150

pool = threadpool.ThreadPool(n)

requests = threadpool.makeRequests(run, data, callback)

[pool.putRequest(req) for req in requests]

pool.wait()

pool.dismissWorkers(n, do_join=True)

#yahoofinance.download_weekly_bars(instrument, year, csvFile)