Or, open the Python docs in your favorite browser, bring the omnibar into focus, and click the little button at the bottom of it to add the Python documentation to your list of available search engines.

In your browser's settings, you can set the shortcut for this search engine as "@python"

Now whenever you're searching, just start typing @python, hit tab to complete, and then type your search term.

I use this all the time in Firefox, and I'm 90% sure it works in Chrome, too.