@aaltay @tvalentyn I'd love to make the cleanup in a separate PR. I've seen errors coming from `futures` package from Python 3.5 to 3.7 and interestingly *installing futures* solves it for me. I've logged the typing issue in [BEAM-5607](https://issues.apache.org/jira/browse/BEAM-5607) and feel free to add more info there. By the way, do you think it's worthwhile to set up a testing matrix for Python 2, 3.5, 3.6 and 3.7 on Jenkins respectively ?
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