Selenium
If you want to run web automation using python and selenium you need to define a path of your web driver. This you can do very easily. Just add this line to your bash_profile or whatever you use (in my case it is .zshrc):
export PATH="/path/to/your/webdriver/directory:$PATH"
Not forget to restart your environment like:
source ~/.zshrc
WebDriver you can download here: https://sites.google.com/a/chromium.org/chromedriver/home