benchmarking django apps

I'm interested in testing the performance of my django apps as I go, what is the best way to get line by line performance data?

note: Googling this returns lots of people benchmarking django itself. I'm not looking for a benchmarks of django, I'm trying to test the performance of the django apps that I'm writing :)

Thanks!

edit: By "line by line" I just mean timing individual functions, db calls, etc to find out where the bottlenecks are on a very granular level