tldr; 'watchpoints' in python can do this already(since before clojure existed), but it's not built into standard pdb. You could do the allocator yourself with

tldr; 'watchpoints' in python can do this already(since before clojure existed), but it's not built into standard pdb. You could do the allocator yourself with a custom allocator easily. Just inspect the object type or object id, and in your meta allocator select the correct allocator. I'm not sure how that would help you with a CCL style WATCH though... pdb, with set_trace or conditions on breakpoints could let you WATCH individual objects. Search google for watchpoints.