I am using selenium with python and have downloaded the chromedriver for my windows computer from this site: http://chromedriver.storage.googleapis.com/index.html?path=2.15/
The best way is maybe to get the current directory and append the remaining address to it.
Like this code(Word on windows. On linux you can use something line pwd):
webdriveraddress = str(os.popen("cd").read().replace("\n", ''))+'\path\to\webdriver'