一旦您等待该元素并在尝试调用click()方法而不是使用presence_of_element_located()method时继续前进，则需要使用 以下方法：
try:
myElem = webdriverwait(self.browser, delay).until(EC.element_to_be_clickable((By.XPATH , xpath)))
present_of_element_located（locator）的定义如下：
class selenium.webdriver.support.expected_conditions.presence_of_element_located(locator)
Parameter : locator - used to find the element returns the WebElement once it is located
Description : An expectation for checking that an element is present on the DOM of a page. This does not necessarily mean that the element is visible or interactable (i.e. clickable).
visible_of_element_located（locator）定义如下：
class selenium.webdriver.support.expected_conditions.visibility_of_element_located(locator)
Parameter : locator - used to find the element returns the WebElement once it is located and visible
Description : An expectation for checking that an element is present on the DOM of a page and visible. Visibility means that the element is not only displayed but also has a height and width that is greater than 0.
element_to_be_clickable（locator）定义如下：
class selenium.webdriver.support.expected_conditions.element_to_be_clickable(locator)
Parameter : locator - used to find the element returns the WebElement once it is visible, enabled and interactable (i.e. clickable).
Description : An Expectation for checking an element is visible, enabled and interactable such that you can click it.
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