Selenium/PhantomJS raises error

Make the path in raw string, add 'r': 

driver = webdriver.PhantomJS(executable_path=r'D:\Python\phantomjs-2.0.0-windows\bin\phantomjs.exe')

For simplicity's sake place the executable in the same directory as your script:

driver = webdriver.PhantomJS() # now there's no need for a path