Py-backwards
Python to python compiler that allows you to use Python 3.6 features
...It does this by parsing the source into an abstract syntax tree (AST), applying transformation rules, and emitting compatible code. This allows teams to write forward-looking Python without immediately upgrading all their runtime environments. The project is particularly handy for packaging, CI, or on-prem situations where upgrading Python is slow or impossible. It aims to preserve behavior, keep the diff small, and support multiple modern features as they appear.