BUG
python
rating = driver.find_element(By.CLASS_NAME, 'll rating_num').text
DEBUG
Message: Compound class names are not allowed.
类名不允许带空格。
即便浏览器里看到的类名是"ll rating_num"，实际类名是"rating_num"。
修改代码为：
python
rating = driver.find_element(By.CLASS_NAME, 'rating_num').text