Selenium TypeError: __init__() got an unexpected keyword argument 'service'

Question

I'm refactoring my app from procedural code to OOP. I am trying to do this Driver class.

UPDATE: this works in Windows but not in Mac.

# IMPORTS
from sys import platform
import os
from os import system

from selenium import webdriver
from selenium.webdriver import Firefox, FirefoxOptions
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.common.keys import Keys
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
# import Action chains 
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.support.ui import Select
from selenium.webdriver.firefox.service import Service

class Driver():
    def __init__(self):
        #set executable path to driver
        self.dirname = os.path.dirname(__file__)
        if platform == "win32":
            self.executable_path = os.path.join(self.dirname, 'geckodriver.exe') #must save the gecko file to same directory where python is. path to geckodriver (firefox drive/motor) on your machine
            print("Gecko (Firefox) filepath is: ", self.executable_path)
        if platform == "darwin":
            self.executable_path = os.path.join(self.dirname, 'geckodriver') #must save the gecko file to same directory where python is. path to geckodriver (firefox drive/motor) on your machine
            print("Gecko (Firefox) filepath is: ", self.executable_path)
            
        self.service = Service(self.executable_path) 
            
        self.opts = FirefoxOptions()
        #self.opts.add_argument(f"--width={int(screen_width/4)}")
        #self.opts.add_argument(f"--height={int(screen_height/2)}")

        self.driver = Firefox(service=self.service, options=self.opts)
        
        self.driver.set_window_position(-10, 0)
        
        self.driver.get("https://google.com/")
    
Driver()

This will give me the following error:

Traceback (most recent call last):
  File "/driverClass.py", line 72, in <module>
    Driver()
  File "/driverClass.py", line 66, in __init__
    self.driver = Firefox(service=self.service, options=self.opts)
TypeError: __init__() got an unexpected keyword argument 'service'

Why is this? I'm refactoring my code to OOP. The code worked before when using procedural code.

This is from the working code:

# driver configs
service = Service(executable_path) #pass in path to geckodriver
opts = FirefoxOptions()
#opts.add_argument(f"--width={int(screen_width/4)}")
#opts.add_argument(f"--height={int(screen_height/2)}")
driver = Firefox(service=service, options=opts)

driver.set_window_position(-10, 0)
#driver.set_window_size(int(screen_width/4), int(screen_height))

driver.get("https://google.com/")

Answer 1

This error message...

TypeError: __init__() got an unexpected keyword argument 'service'

...implies that service is an unexpected keyword argument.

The possible reason, you are still using Selenium v3.x and the keyword argument service wasn't supported.

---

Solution

Since Selenium 4.0 Beta 1:

Deprecate all but Options and Service arguments in driver instantiation. (#9125,#9128)

So you need to upgrade to Selenium 4.x

---

References

You can find a couple of relevant detailed discussion in:

• TypeError: init() got an unexpected keyword argument 'service' error using Python Selenium ChromeDriver with company pac file

Answer 2

self.driver = Firefox(service=self.service, options=self.opts)

The Firefox webdriver doesn't take a service keyword argument: https://selenium-python.readthedocs.io/api.html#module-selenium.webdriver.firefox.webdriver

It would be helpful to see the older working version.

Answer 3

As you can see when you call

Firefox(service=self.service, options=self.opts)

it raises because Firefox class does not accept service kwarg

If you are trying to set up a Firefox web driver you can see similar question

Answer 4

I encountered the same error and fixed this problem by upgrading to Selenium 4.0

I am using Anaconda python.

To upgrade to Selenium 4.0 on Anaconda, run the following command;

$ conda install https://conda.anaconda.org/conda-forge/noarch::selenium

The following command also works fine.

$ conda install selenium --channel conda-forge/noarch

At this point of writing, you cannot upgrade Selenium using the normal conda command conda update selenium. Running this command will install selenium v3

You have to specify the installation on the noarch version which supports selenium v4.1

The link below teaches you how to do that.

Specify platform during package install