Python - NYC documents

#
# http://stackoverflow.com/questions/39398592/python-get-javascript-file-from-href-tag-of-html
#

import requests
import lxml.html

url = 'http://a810-bisweb.nyc.gov/bisweb/COsByLocationServlet?requestid=1&allbin=3055311'

r = requests.get(url)
#print(r.status_code)

html = lxml.html.fromstring(r.text)

for a in html.xpath('//td[@class="content"]/a[contains(@href, "javascript")]'):
    name = a.attrib['href'][14:-12]
    parts = name.split('_')
    f0 = parts[1]
    f1 = parts[4][0] # B
    f2 = parts[4][1:4] # 000
    f3 = parts[4][4:7] + '000' # 11400
    f4 = parts[4]

    download = [
        'http://a810-bisweb.nyc.gov/bisweb/CofoDocumentContentServlet',
        '?cofomatadata1=', f0,
        '&cofomatadata2=', f1,
        '&cofomatadata3=', f2,
        '&cofomatadata4=', f3,
        '&cofomatadata5=', f4,
    ]

    download = ''.join(download)
    r = requests.get(download, stream=True)

    print('Download:', f4)

    with open(f4, 'wb') as fout:
        for chunk in r.iter_content(1024):
            fout.write(chunk)