This is nicely implemented, however like for most code search engine I'm wondering what is the exact use case? When I want to search for a function, I usually try Google and find sample codes on forums, GitHub or Stack Exchange sites along with detailed information and discussions about them. What additional feature would searchcode provide?
Personally I use it quite a lot when looking for implementations. I also used code search before searchcode as well to do this, so it fits into my workflow.
However I also use DuckDuckGo, and a !code redirects to searchcode for this so there is that.
Possibly it depends on how you learn and use things. I find examples useful. For instance when looking at how to do things in Python's Fabric I would rather see some examples then read about how someone else doing it.
