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How do I run command from web browser console in python?

KDJ

I have recently been trying to run a command through python in a web browser, as if using chrome developer tools.

This is easy to do from chrome, but how would I do it from python? I have no idea how I would go about replicating this from a python script. The browser command I am wanting to run is specific to the website I am working with, which is why I need to use the command line.

How can I repsslicate running a command in the browser command line, in python 3? Sorry if this is a stupid question. Thanks!

EDIT: I ended up using selenium, but ran into some problems. The site I am traveling to( roblox.com ), says that I am Unauthorized in the browser console. Picture2 I am pretty sure that I implemented the authentication cookies correctly though, as I am logged in. For some reason, some of my data just isn’t loading, such as my currency count.

This probably isn’t the place to ask a question like this, since the members of this forum know nothing of roblox, but maybe it’s a simple problem in my code.

# my code
from selenium import webdriver
import time

driver = webdriver.Chrome('C:\UsersKDJDocumentsGameJoinerchromedriver.exe')
options = webdriver.ChromeOptions()

driver.execute_cdp_cmd('Network.setUserAgentOverride', {"userAgent": 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.53 Safari/537.36'})
driver.execute_script("Object.defineProperty(navigator, 'webdriver', {get: () => undefined})")
options.add_experimental_option("excludeSwitches", ["enable-automation"])
options.add_experimental_option('useAutomationExtension', False)


URL = 'https://www.roblox.com/games'
driver.get(URL)
driver.add_cookie({'name' : '.ROBLOSECURITY', 'value' : Cookie})



driver.get(URL)

As a side note, you might not see me defining the Cookie variable. This is because I removed it, since this cookie allows others to log into my account.

enter image description here

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Answer

You can use Selenium to do that. With selenium, you can programmatic emulate your browser behaviour. These are the steps:

  • Download chromedriver according to your OS. Unzip it to a directory directory e.g. /Users/me/Documents/MyPrograme/

  • Install selenium:

python -m pip install selenium
  • Usage example:
# example.py

from selenium import webdriver

# Start Chrome Driver
chromedriver = 'Users/me/Documents/MyPrograme/chromedriver'

driver = webdriver.Chrome(chromedriver)

# Open the URL you want to execute JS
URL = 'https://www.example.com'
driver.get(URL)

# Execute JS

driver.execute_script("console.log(`Hello from Python`)")

For examples and details read selenium‘s documentation.

Another way is to use RPA-like libraries, e.g. PyAutoGUI or RPA-Python, to automate opening of chrome, send keys and commands to open console and send texts as scripts-commands.

Updates

  • Attempting to overcome 404 in Selenium Chrome
# Add headers

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
opts = Options()

user_agent =  ('Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) '
'AppleWebKit/537.36 (KHTML, like Gecko) '
'Chrome/39.0.2171.95 Safari/537.36')
opts.add_argument(f'user-agent={user_agent}')

driver = webdriver.Chrome(chrome_options=opts)
  • Emulate the process If the website involves login. Perform the steps a human being will take. E.g. One webpage, go through logging, find inputs and password elements and emulate typing and clicking/or keyboard events.

Updates II

  • Dealing with pop ups
    Use driver.switchTo whatever frame that pops up.
# find element in your popup. Something like
dialog_name = 'Open Rebox?'
pop_element = driver.find_element_by_name(dialog_name)
pop = driver.switch_to.frame(pop_element)

# find what you need to click or use tab
# ...
pop.click()
# switch back to main
driver.switch_to.parent_frame()
  • Look at examples in SO on how to switch
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