PDB has the interact command that drops you into a full blown python repl at the debug point. Changing an existing method on a class isn't a big deal. Redefini

PDB has the interact command that drops you into a full blown python repl at the debug point. Changing an existing method on a class isn't a big deal. Redefining a class is possible as well but updating existing instances to the new class requires metaprogramming tomfoolery.