If you are using a Mac, then don't include '.exe' I put the selenium package directly into my Pycharm project that I called 'SpeechRecognition'. Then in the selenium file, navigate to: /selenium/webdriver/chrome, then copy and paste the 'chromedriver.exe' file you downloaded most likely from [here][1]
Try this script if you are using PyCharm IDE or similar. This should open a new Google window for you.
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
browser = webdriver.Chrome('/Users/Name/PycharmProjects/SpeechRecognition/selenium/webdriver/chrome/chromedriver')
browser.get('http://www.google.com')
Then if you want to automatically search an item on Google, add these lines below and run. You should see an automatic google search window opening up. It might disappear quickly but to stop that, you can simply add a while loop if you want or a timer
search = browser.find_element_by_name('q')
search.send_keys('How do I search an item on Google?')
search.send_keys(Keys.RETURN)
[1]: https://sites.google.com/a/chromium.org/chromedriver/home