i have a python library that does it: https://github.com/andreycizov/python-race https://github.com/andreycizov/python-race It uses generators and their yield

i have a python library that does it: https://github.com/andreycizov/python-race https://github.com/andreycizov/python-race It uses generators and their yield as the yield point (and supports running arbitrary functions under a debugger)