Question: I've been struggling with this problem for sometime, but now I'm coming back around to it. I'm attempting to use selenium to scrape data from a URL behind a company proxy using a pac file. I'm using Chromedriver, which my browser uses the pac file in it's configuration. I've been trying to use desired_capabilities, but the documentation is horrible or I'm not grasping something. Originally, I was attempting to webscrape with beautifulsoup, which I had working except the data I need now is in javascript, which can't be read with bs4. Below is my code: import pandas as pd from selenium import webdriver from selenium.webdriver.common.by import By from selenium.webdriver.chrome.service import Service from selenium.webdriver.chrome.options import Options from selenium.webdriver.common.proxy import Proxy, ProxyType from selenium.webdriver.common.desired_capabilities import DesiredCapabilities from selenium.webdriver.support.ui import WebDriverWait from selenium.webdriver.support import expected_conditions as EC desired_capabilities = webdriver.DesiredCapabilities.CHROME.copy() PAC_PROXY = { 'proxyAutoconfigUrl': 'http://proxy-pac/proxy.pac', } proxy = Proxy() proxy.proxy_autoconfig_url = PAC_PROXY['proxyAutoconfigUrl'] desired_capabilities = {} proxy.add_to_capabilities(desired_capabilities) URL = "https://mor.nlm.nih.gov/RxClass/search?query=ALIMENTARY%20TRACT%20AND%20METABOLISM%7CATC1-4&searchBy=class&sourceIds=a&drugSources=atc1-4%7Catc%2Cepc%7Cdailymed%2Cmeshpa%7Cmesh%2Cdisease%7Cmedrt%2Cchem%7Cdailymed%2Cmoa%7Cdailymed%2Cpe%7Cdailymed%2Cpk%7Cmedrt%2Ctc%7Cfmtsme%2Cva%7Cva%2Cdispos%7Csnomedct%2Cstruct%7Csnomedct%2Cschedule%7Crxnorm" service = Service('C:\Program Files\Chrome Driver\chromedriver.exe') driver = webdriver.Chrome(service=service) driver.get(URL) print(driver.requests[0].headers, driver.requests[0].response) WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.CSS_SELECTOR, 'tr.dbsearch'))) print(pd.read_html(driver.page_source)[1].iloc[:,:-1]) pd.read_html(driver.page_source)[1].iloc[:,:-1].to_csv('table.csv',index=False)  I'm not sure why I'm receiving an: TypeError: __init__() got an unexpected keyword argument 'service'  even when I have the path added correctly to my system environment variables as shown below:  Essentially what I'm attempting to do is scrape the data in the table from https://mor.nlm.nih.gov/RxClass/search?query=ALIMENTARY%20TRACT%20AND%20METABOLISM%7CATC1-4&searchBy=class&sourceIds=a&drugSources=atc1-4%7Catc%2Cepc%7Cdailymed%2Cmeshpa%7Cmesh%2Cdisease%7Cmedrt%2Cchem%7Cdailymed%2Cmoa%7Cdailymed%2Cpe%7Cdailymed%2Cpk%7Cmedrt%2Ctc%7Cfmtsme%2Cva%7Cva%2Cdispos%7Csnomedct%2Cstruct%7Csnomedct%2Cschedule%7Crxnorm then store it to a pandas dataframe and pass it to a csv file.

Answer: If you are still using Selenium v3.x then you shouldn't use the Service() and in that case the key executable_path is relevant. In that case the lines of code will be: driver = webdriver.Chrome(executable_path='C:\Program Files\Chrome Driver\chromedriver.exe')   Else, if you are using selenium4 then you have to use Service() and in that case the key executable_path is no more relevant. So you need to change the line of code: service = Service(executable_path='C:\Program Files\Chrome Driver\chromedriver.exe') driver = webdriver.Chrome(service=service)  as: service = Service('C:\Program Files\Chrome Driver\chromedriver.exe')