I would go in a way that we create an spinoff issue for the fromisoformat refactoring in the future (the more standard library the better IMHO, we need only LXML and request-like lib so far, so no new dependancy), that would depend on actual drop of Py3.6 support in pyodata - I created issue #190 for that.

Originally posted by @phanak-sap in #184 (comment)