In the past, some developers complained when an import has been removed in a stdlib module. I vaguely recall code using "import os" to get the "errno" module from "os.errno". That's "What's New in Python 3.7" contains:

"Several undocumented internal imports were removed. One example is that os.errno is no longer available; use import errno directly instead. Note that such undocumented internal imports may be removed any time without notice, even in micro version releases."

For this reason, I don't think that stable versions (2.7 and 3.7) should be modified.