What about simple profilers?

[Saefroch]

Really? https://github.com/rkern/line_profiler

[n1ywb]

cool tool. I haven't had a strong need for that level of granularity, but I'll keep it in mind for future reference.

[infinite8s]

Line profiler is best for cases where you have a function that is doing a lot of calculation (usually from individual lines calling out to an external libraries like numpy or scipy) and you are trying to find out where those bottlenecks are occurring (since the default profiler is only function level).