How to make complex PYTHON PROGRAMM FOR STOCK MARKET simply

# import following modules
import csv
import urllib.request
import time
import string
import os
import sys

""" Select stock market website
 Example , Colombo stock market csv site link is  "http://www.cse.lk/listedcompanies/overview.htm?d-16544-e=1&6578706f7274=1" this link grabbed from www.cse.lk like wise you also can select your website link like this.""

# Now acquire the csv data from www.cse.lk to local folder  by requesting url