Run, Python, Run!
hbfs.wordpress.com/2011/09/13/run-python-run
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
The tool, RunSnakeRun, inserts hooks in the Python interpreter to build a report of where time is spent, a bit à la Valgrind/Kcachegrind but much simpler, and to display the results using both tables and a rectangular tree-structured inclusion graph