chadrik commented on issue #10821: Install typing package only for Python < 3.5 URL: https://github.com/apache/beam/pull/10821#issuecomment-596808467 > typing_extensions is always required. I guess I should say, it's always required until such a time as `Protocol` and `Literal` are both included in `typing` _and_ we drop versions of python3 that don't include a new enough version of `typing`.
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