Implicit, explicit wait | Rustam Zokirov

Implicit wait

time.sleep(10) pauses code execution exactly 10 seconds.
driver.implicitly_wait(10) waits maximum 10 seconds for element's presence. If it is found after 2 seconds then code execution will be continued without wait for more 8 seconds.
Implicit Wait time is applied to all the elements in the script.
Explicit Wait time is applied only to those elements which are intended by us.

from selenium import webdriver

driver = webdriver.Firefox()
driver.implicitly_wait(10) # seconds
driver.get("http://somedomain/url_that_delays_loading")
myDynamicElement = driver.find_element_by_id("myDynamicElement")

Explicit wait

A custom wait condition can be created using a class with __call__ method which returns False when the condition doesn’t match.

class element_has_css_class(object):
  """An expectation for checking that an element has a particular css class.

  locator - used to find the element
  returns the WebElement once it has the particular css class
  """
  def __init__(self, locator, css_class):
    self.locator = locator
    self.css_class = css_class

  def __call__(self, driver):
    element = driver.find_element(*self.locator)   # Finding the referenced element
    if self.css_class in element.get_attribute("class"):
        return element
    else:
        return False

# Wait until an element with id='myNewInput' has class 'myCSSClass'
wait = WebDriverWait(driver, 10)
element = wait.until(element_has_css_class((By.ID, 'myNewInput'), "myCSSClass"))