必须导入类By

from selenium.webdriver.common.by import By

from selenium.webdriver.common.by import By

第1001章：我的selenium.webdriver.common.by
根据By实现的文档：

class By(object):
    """
    Set of supported locator strategies.
    """

    ID = "id"
    XPATH = "xpath"
    LINK_TEXT = "link text"
    PARTIAL_LINK_TEXT = "partial link text"
    NAME = "name"
    TAG_NAME = "tag name"
    CLASS_NAME = "class name"
    CSS_SELECTOR = "css selector"

因此，当您使用**By**时，您必须汇入：

from selenium.webdriver.common.by import By

用法

• 对于 * 类名称 *：

vegetable = driver.find_element(By.CLASS_NAME, "tomatoes")

• 对于 XPATH：

vegetable = driver.find_element(By.XPATH, "//element_xpath")