XMLTV time offset

from lxml import etree
import sys
import requests

while True:
    try:
        URL = 'http://example.com'

        response = requests.get(URL)
        with open('xmltv-utc.xml', 'wb') as file:
            file.write(response.content)

        xml_file = "xmltv-utc.xml"
        xml_file_output = 'xmltv-france.xml'

        parser = etree.XMLParser(remove_comments=False)
        tree = etree.parse(xml_file, parser)
        root = tree.getroot()

        for programme in root.iter("programme"):
            replaced_time_offset_start = programme.get("start").replace("+0000", "+0200")
            replaced_time_offset_stop = programme.get("stop").replace("+0000", "+0200")
            programme.set("start", replaced_time_offset_start)
            programme.set("stop", replaced_time_offset_stop)

        tree.write(xml_file_output)
        raise SystemExit
    except SystemExit:
        exit()
    except:
        pass