import quandl
import os

quandl.ApiConfig.api_key  = #YOUR_API_KEY

start_date, end_date = '2007-07-30', '2017–09–30'
use_columns = ['date', 'ticker', 'adj_open', 'adj_close', 'adj_high', 'adj_low']  #columns of our concern
tickers = []  #add tickets that you want to work with