An elegant way to get hashtags out of a string in Python?

I'm looking for a clean way to get a set (list, array, whatever) of words starting with # inside a given string.

In C#, I would write

var hashtags = input
    .Split (' ')
    .Where (s => s[0] == '#')
    .Select (s => s.Substring (1))
    .Distinct ();

What is comparatively elegant code to do this in Python?

EDIT

Sample input: "Hey guys! #stackoverflow really #rocks #rocks #announcement"
Expected output: ["stackoverflow", "rocks", "announcement"]