Need to drop code paths specific to Python 3.7 and 3.8 once we stop supporting those versions #835
Description
When we drop support for Python 3.7 and 3.8, we need to drop support for code paths intended solely for those Python versions. Such code paths should ideally be marked by referencing this issue in a TODO, but to be conscientious we should also grep for the strings "3.7" and "3.8".