chromeOptions = webdriver.ChromeOptions()
chromeOptions.add_argument('--proxy-server=http://ip:port') 
driver = webdriver.Chrome(chrome_options=chromeOptions)

from selenium import webdriverdef create_proxyauth_extension(proxy_host, proxy_port,
                proxy_username, proxy_password,
                scheme='http', plugin_path=None):
  """Proxy Auth Extension

  args:
    proxy_host (str): domain or ip address, ie proxy.domain.com
    proxy_port (int): port
    proxy_username (str): auth username
    proxy_password (str): auth password
  kwargs:
    scheme (str): proxy scheme, default http
    plugin_path (str): absolute path of the extension    

  return str -> plugin_path
  """
  import string
  import zipfile

  if plugin_path is None:
    plugin_path = 'd:/webdriver/vimm_chrome_proxyauth_plugin.zip'

  manifest_json = """
  {
    "version": "1.0.0",
    "manifest_version": 2,
    "name": "Chrome Proxy",
    "permissions": [
      "proxy",
      "tabs",
      "unlimitedStorage",
      "storage",
      "<all_urls>",
      "webRequest",
      "webRequestBlocking"
    ],
    "background": {
      "scripts": ["background.js"]
    },
    "minimum_chrome_version":"22.0.0"
  }
  """

  background_js = string.Template(
  """
  var config = {
      mode: "fixed_servers",
      rules: {
       singleProxy: {
        scheme: "${scheme}",
        host: "${host}",
        port: parseInt(${port})
       },
       bypassList: ["foobar.com"]
      }
     };

  chrome.proxy.settings.set({value: config, scope: "regular"}, function() {});

  function callbackFn(details) {
    return {
      authCredentials: {
        username: "${username}",
        password: "${password}"
      }
    };
  }

  chrome.webRequest.onAuthRequired.addListener(
        callbackFn,
        {urls: ["<all_urls>"]},
        ['blocking']
  );
  """
  ).substitute(
    host=proxy_host,
    port=proxy_port,
    username=proxy_username,
    password=proxy_password,
    scheme=scheme,
  )
  with zipfile.ZipFile(plugin_path, 'w') as zp:
    zp.writestr("manifest.json", manifest_json)
    zp.writestr("background.js", background_js)

  return plugin_path

proxyauth_plugin_path = create_proxyauth_extension(
  proxy_host="proxy.crawlera.com",
  proxy_port=8010,
  proxy_username="fea687a8b2d448d5a5925ef1dca2ebe9",
  proxy_password=""
)


co = webdriver.ChromeOptions()
co.add_argument("--start-maximized")
co.add_extension(proxyauth_plugin_path)


driver = webdriver.Chrome(chrome_options=co)
driver.get(http://www.amazon.com/)