How to Maximize window in chrome using webDriver (python)

You could use ChromeOptions and set suitable argument:

options = ChromeOptions()
options.add_argument("--start-maximized")
driver = ChromeDriver(options)

For MAC or Linux:

ChromeOptions chromeOptions = new ChromeOptions();
chromeOptions.addArguments("--kiosk");
driver = new ChromeDriver(chromeOptions);

For Windows:

ChromeOptions chromeOptions = new ChromeOptions();
chromeOptions.addArguments("--start-maximized");
driver = new ChromeDriver(chromeOptions);

Nothing worked for me except:

driver.set_window_size(1024, 600)
driver.maximize_window()

I found this by inspecting selenium/webdriver/remote/webdriver.py. I've never found any useful documentation, but reading the code has been marginally effective.