Here are some useful tips and tools for debugging.
You can enable and disable profiling using the HTTP API, so you must use --status 8080.
curl --data '{"start": true}' "http://127.0.0.1:8080/v1a/profiler/"
curl --data '{"stop": true, "filepath": "/full/path/to/output.prof"}' "http://127.0.0.1:8080/v1a/profiler/"
You can use --pudb to enable pudb to stop execution when an unhandled exception is raised.
Notice that you have to manually install the package pudb.
Documentation: https://documen.tician.de/pudb/
You can use objgraph to draw object reference graphs using graphviz. For example, you can use
objgraph.show_backrefs(x) to find out why an object has not been cleared by the garbage collector.
Notice that you have to manually install objgraph.
Documentation: https://mg.pov.lt/objgraph/