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driver.find_element_by_id("login-button").click()
from selenium.common.exceptions import NoSuchElementException
try:

    if (driver.find_element_by_link_text("welcome screen")): #<-- sometimes this elements appears randomly, i was to click on it when and if it appears
        driver.find_element_by_link_text("welcome screen").click()
except NoSuchElementException:
        print "No welcome screen"

time.sleep(3)
driver.find_element_by_link_text("Stacks").click()


------------------------------
./check_stacks.py
Traceback (most recent call last):
  File "./check_stacks.py ", line 44, in <module>
    if (driver.find_element_by_link_text("welcome screen")):
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 282, in find_element_by_link_text
    return self.find_element(by=By.LINK_TEXT, value=link_text)
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 712, in find_element
    {'using': by, 'value': value})['value']
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 201, in execute
    self.error_handler.check_response(response)
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 181, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: Unable to locate element: {"method":"link text","selector":"welcome screen"}
Stacktrace:
    at FirefoxDriver.prototype.findElementInternal_ (file:///var/folders/d6/gmdplmmx69502yrdlq4lfvtw0000gn/T/tmpmajndq/extensions/fxdriver@googlecode.com/components/driver-component.js:10659)
    at fxdriver.Timer.prototype.setTimeout/<.notify (file:///var/folders/d6/gmdplmmx69502yrdlq4lfvtw0000gn/T/tmpmajndq/extensions/fxdriver@googlecode.com/components/driver-component.js:621)