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May 22
line profiler in python python
cProfile and friends work well for profiling larger programs where things are split into functions. For more detailed investigation, however, you need something like line_profiler, where you can see output like this (trimmed): 
Line #      Hits         Time  Per Hit   + Time  Line Contents
==============================================================
...
202      1741        12946      7.4      0.0      for k in zip(K.I, K.J):
203      1740       222659    128.0      0.9          K[k] = randn()
...
Once installed, decorate any function worthy of analysis with @profile, run kernprof.py -l <scriptname.py> and then view results with python -m line_profiler <scriptname>.lprof. Works well.