Different methods to find an element

-By Xpath
a = driver.find_element_by_xpath("/html/body/div[4]/div/ul/li[1]/a")

-By ID
a = driver.find_element_by_id("username")

-By Link text
a = self.find_element_by_link_text("Sign Up!")

-By Name
a = driver.find_element_by_name("email")