Python code rarely breaks between minor version releases in my experience. Python 3.5 introduced the `async` keyword (PEP 492), and Python 3.7 changed `StopIter

Python code rarely breaks between minor version releases in my experience. Python 3.5 introduced the `async` keyword (PEP 492), and Python 3.7 changed `StopIteration` handling in generators (PEP 479).