How to keep browser open using Selenium Python

Setting the detach parameter to true will keep the browser open after the process has ended, so long as the quit command is not sent to the driver. 

Add a binary to options:

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from selenium import webdriver

chrome_opts = webdriver.ChromeOptions()
chrome_opts.add_experimental_option("detach",True) #This will keep browser open
driver = webdriver.Chrome(options=chrome_opts)

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Same applicable to remaining browsers.