Add type annotation for the codebase

[leonardge]

To better maintain the codebase, we need to add type annotation.

[apogiatzis]

Since we started adding typings now we can utilize mypy (http://mypy-lang.org/) to do type checking at PR/commit time as well.

[leofisG]

This is great suggestions!

…

On Thu, Jul 16, 2020 at 10:16 PM apogiatzis ***@***.***> wrote: Since we started adding typings now we can utilize mypy ( http://mypy-lang.org/) to do type checking at PR/commit time as well. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#15 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACMFDUID23PQE6NLZ4LRAZDR35U3VANCNFSM4OXYH7BQ> .

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