Get updates for TIA Portal [SIEMENS]

from itertools import chain
from urllib.request import urlopen
import json
import sys

try:
    from lxml.etree import fromstring
except:
    print('Please install with pip lxml')
    print('pip install lxml')
    sys.exit(1)


def get_product_updates():
    base = 'https://update.industry.siemens.com/asu/files/tiaportal/'
    xml = 'UpdatesSummaryCatalog.xml'
    xml_data = urlopen(base + xml).read()
    et = fromstring(xml_data)

    for product in et.findall('Updates/Product'):
        try:
            name = product.xpath('DisplayName')[0].text
            path = product.xpath('Path')[0].text.replace('[MAINURL]', base)
            siwa = product.xpath('SiWA')[0].text
            file = path + siwa
            cabs = []
            for cab in product.xpath('CabFile'):
               if cab.text:
                   cabs.append(base + cab.text)
        except (IndexError, TypeError):
            continue
        else:
            yield {'name': name, 'files': list(chain([file], cabs))}

if __name__ == '__main__':
    print(json.dumps(list(get_product_updates()), indent=4))