pytest报错E AttributeError: ‘Test_baidu‘ object has no attribute ‘driver‘ 如果加个DEF就报错，去了就成功，求指教

如果增加一个def执行就报错

import time
from selenium import webdriver
import pytest


class Test_baidu(object):

    def test_dlu(self):
        self.driver = webdriver.Chrome()
        self.driver.maximize_window()

        self.driver.get('https://www.baidu.com')
        time.sleep(5)

    def test_dlu1(self):
        self.driver.find_element_by_xpath("/html/body/div[1]/div[1]/div[3]/a[1]").click()

如果没有def就可以运行成功

from selenium import webdriver
import pytest


class Test_baidu(object):

    def test_dlu(self):
        self.driver = webdriver.Chrome()
        self.driver.maximize_window()

        self.driver.get('https://www.baidu.com')
        time.sleep(5)

    #def test_dlu1(self):
        self.driver.find_element_by_xpath("/html/body/div[1]/div[1]/div[3]/a[1]").click()

 请问大佬问题出在哪了？