urllib.error.URLError: <urlopen error Tunnel connection failed: 407
Proxy Authentication Required>

header = {
    'User-Agent': "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.134 Safari/537.36"}

proxy_host = '0.0.0.0:20829'
        PROXY_USERNAME = b'uername'
        PROXY_PASSWORD = b'password'
        proxy_auth = urlsafe_b64encode(b'%s:%s' % (PROXY_USERNAME,
PROXY_PASSWORD))
        req = Request(url, headers=header)
        req.set_proxy(proxy_host, 'https')
        req.add_header('Proxy-Authorization', 'Basic %s' % proxy_auth)
        response = urlopen(req)
        return BeautifulSoup(response, 'html.parser')