找不到元素会抛异常

Selenium的find_element_by_xpath，是找单个元素，如果找不到，则会抛异常NoSuchElementException

->和常见的逻辑，找不到只返回空None，不一样

-》代码中要注意，根据你的需要，可能需要捕获异常

举例：

for curIdx, eachNormalLi in enumerate(normalLiList):
    try:
        descItem = eachNormalLi.find_element_by_xpath(".//div[@class='b_caption']/p")
    except:
        logging.error("Failed to find description(b_caption) element")
        continue

而对应的，找多个元素，返回列表的find_elements_by_xpath，则不会排除异常，如果找不到，则返回空列表[]而已

总结：

• 找单个元素的 find_element_by_xpath
  • 如果找不到，会抛出异常NoSuchElementException
    • 你需要根据你的情况决定，是否要捕获异常
  • 对应官网解释

    find_element_by_xpath(xpath)

    Finds an element by xpath.

    Args:

    • xpath - The xpath locator of the element to find.

    Returns:

    • WebElement - the element if it was found

    Raises::

    • NoSuchElementException - if the element wasn’t found

    Usage:

    element = driver.find_element_by_xpath(‘//div/td[1]’)

• 找多个元素的 find_elements_by_xpath
  • 如果找不到，只是返回空列表，不会抛异常 -》 无需捕获异常
  • 对应官网解释

    find_elements_by_xpath(xpath)

    Finds multiple elements by xpath.

    Args:

    • xpath - The xpath locator of the elements to be found.

    Returns:

    • list of WebElement - a list with elements if any was found. An empty list if not

    Usage:

    elements = driver.find_elements_by_xpath(“//div[contains(@class, ‘foo’)]”)