import unittest
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
import time
from functools import wraps
from selenium.common.exceptions import TimeoutException, NoSuchElementException, StaleElementReferenceException
from selenium.webdriver.support.wait import WebDriverWait
import lxml.html
import codecs
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import os
import re
from selenium.webdriver.common.action_chains import ActionChains
driver = webdriver.Chrome('C:/Python34/chromedriver.exe')
driver.get("https://www.site.com/")
ActionChains(driver).key_down(Keys.CONTROL).send_keys('t').key_up(Keys.CONTROL).perform()
При этом нет никакой ошибки. Другой вариант так же не работает:
driver.find_element_by_tag_name('body').send_keys(Keys.CONTROL+ 't')