title: How can I insert path (environmental variable) for geckodriver in google colab?
body: <p>I want to run selenium in Google Colab through gecko driver, but it told me: executable needs to be in PATH</p>
  
  <p>I uploaded firefox and gecko driver in Google Colab and copied gecko driver's path. The code worked well on my PC.</p>
  
  <p>firefox and gecko driver in google clob, but an error occurred. </p>
  
  <pre><code>from selenium import webdriver
  from selenium.webdriver.support.ui import WebDriverWait as wait
  from selenium.webdriver.support import expected_conditions as EC
  from selenium.webdriver.common.keys import Keys
  import time
  from selenium.webdriver.support import ui
  from selenium.webdriver.common.by import By
  from selenium import webdriver
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
  
  from selenium.common.exceptions import TimeoutException
  
  
  driver =  webdriver.Firefox(executable_path=r'content/geckodriver.exe')
  
  WebDriverException: Message: 'content/geckodriver.exe' executable needs to be in PATH.
  </code></pre>
  
  <p>I want gecko driver should be known by selenium in Google Colab environment.</p>