Also, if you're talking about specifically replacing a source files (i.e. modules), one could hack around with https://docs.python.org/3/library/importlib.html#

Also, if you're talking about specifically replacing a source files (i.e. modules), one could hack around with https://docs.python.org/3/library/importlib.html#importlib.reload https://docs.python.org/3/library/importlib.html#importlib.r.... I think it would work with enough indirection/factory functions.