book.py

import re
import requests

def downloadToFile(url):
    local = url.split('/')[-1]
    r = requests.get(url)
    f = open(local, 'wb')
    for chunk in r.iter_content(chunk_size=512 * 1024):
        if chunk: 
            f.write(chunk)
    f.close()
    return

ext = ".epub"
listOfBooks={
    'http://www.oreilly.com/programming/free/hadoop-with-python.csp',
    'http://www.oreilly.com/programming/free/microservices-for-java-developers.csp'
}
for key in listOfBooks:
    retorno  = re.search(r"free/(.*?).csp", key).group(0)
    book     = retorno.split('free/')[1].strip('.csp')
    fileName ='http://www.oreilly.com/programming/free/files/'+book+ext
    downloadToFile(fileName);