全程按照官方 instruction: 
pip install selenium 下载了 library. 
然后执行 demo: 
from selenium import webdriver


driver = webdriver.Chrome()

driver.get("http://selenium.dev")

driver.quit()

随后直接大 error: 
---------------------------------------------------------------------------
WebDriverException                        Traceback (most recent call last)
Cell In[2], line 1
----> 1 driver = webdriver.Chrome()...