python-debugpy

You can debug a long-running Python daemon by using debugpy to attach a remote debugging session via the DAP protocol. This allows you to inspect and control execution without restarting the service.

To inspect state across multiple threads, use debugpy remote debugging or the pdb REPL. These tools support flexible workflows for attaching to running processes and testing code paths across threads.

Yes, pdb is a built-in Python module that provides an interactive local debugging experience with zero dependencies. It allows you to quickly inspect variables and step through code.

Yes, remote debugging with debugpy requires exposing a debugging port so the DAP client can attach to the running process. You can also insert breakpoints directly into the code as needed.

You can attach a debugger to a running Python application by leveraging debugpy's DAP-based remote debugging. This enables you to attach to active daemons and inspect their state interactively.