Selenium wait until one of the two elements is present

Question

A lot of times I want the webdriver to wait for presence of one of the two elements. Normally this happens when I am expecting the page to be showing either element1 in some cases or element 2. Currently I am doing this sequentially using two waits, but it's inefficient since I need to wait 2 times. Is there any way to combine the two waits into one? In other words I want to wait until element1 or element2 is present.

try: 
  element = WebDriverWait(self.browser, 15).until(EC.presence_of_element_located((By.ID, "elem1")))
  element.click()
  return "elem1"
except: 
  print "failed to find elem1"

try: 
  element = WebDriverWait(self.browser, 5).until(EC.presence_of_element_located((By.ID, "elem2")))  
  return "elem2"    
except:
  print "sth wrong!"
  raise  Exception("Sth Wrong!") 

return "Should not get here"      

Answer 1

You can do an OR

driverWait.until(ExpectedConditions.or(
    ExpectedConditions.presenceOfElementLocated(By.cssSelector("div.something")),
    ExpectedConditions.presenceOfElementLocated(By.cssSelector("div.anything"))));