def click(self, locator, timeout=0, index=0):
""" click on an element
:type locator: tuple(str, str | list[WebElement] | WebElement)
:type timeout: int
:type index: int
:rtype: WebElement
"""
if timeout == 0:
element = self.find(locator)
element.click()
else:
element = WebDriverWait(self, timeout).until(
EC.element_to_be_clickable(locator, index))
element._execute(Command.CLICK_ELEMENT)
return element
