From one Quixote handler, you want to send the user to a different URL.
Use the redirect() function from the quixote package. It sets the proper header to redirect the client and returns a small HTML page with a link to the new location in case the client doesn't follow redirects properly.
from quixote import redirect ... return redirect("http://www.example.com")
The method passes the current URL and the string argument you provide to Python's urlparse.urljoin() function, so you can use relative paths.
You can also use the get_path(N) function to get the current path with N components removed. If the current path is "/abc/def/", the following code will redirect to "/abc/":
from quixote import redirect, get_path ... return redirect(get_path(1) + '/')