rr should work on Python, but you need to make sure that you have all of your GDB config set up to properly interact with python objects so that you aren't dealing with the raw CPython too much. GDB plugins are very powerful and if you find the right ones you can have an excellent experience in just about any language. (I don't know the current state of Python but a number of years ago it was pretty acceptable). However it probably will never be quite as convenient as IPDB on pure-python code. So in the past I have switched back and forth, using IPDB for the simpler stuff and breaking out rr+GDB when I needed advanced features (like time travel)