title: expected_conditions._find_element throws an error: AttributeError: 'str' object has no attribute 'find_element'
body: <p>I have to wait some element appearances, and I use:</p>
  
  <pre><code>re_enter_email_field = WebDriverWait(self.driver, 10).until(
                  expected_conditions._find_element(By.ID,"u_0_f"))
  </code></pre>
  
  <p>But each time I run a test, I get an error:</p>
  
  <pre><code>Error
  
    File "/home/akop/py_workspace/MacPaw_FB/pages/LoginPage.py", line 56, in submit_new_account_form
      expected_conditions._find_element(By.ID,"u_0_f"))
    File "/home/akop/py_workspace/t_sade_site/site_env/lib/python3.5/site-packages/selenium/webdriver/support/expected_conditions.py", line 398, in _find_element
      return driver.find_element(*by)
  AttributeError: 'str' object has no attribute 'find_element'
  </code></pre>