Jukka Lehtosalo is a Finnish Software Engineer at Dropbox. He developed an optional type system forPython,mypy, during his PhD thesis in Cambridge. After meeting in aPython conference,Guido vanRossum (creator ofPython) invited Lehtosalo tojoin him at Dropbox. They started adoptingmypy in real use cases during a Hackathon, which led tomypy being one of the most popularPython type checkers

One of the main selling points forPython is thatit is dynamically-typed. There is no plan to change this. Nevertheless, in September 2014Guido vanRossum (Python BDFL)created apython enhancement proposal (PEP-484) to add type hints toPython.It has been released for generalusage a year later, in September 2015, as part ofPython 3.5.0. Twenty-five years intoits existence now there was a st

Watch Now This tutorial has a related video coursecreated by the RealPython team. Watchit together with the written tutorial to deepen your understanding:Python Type Checking In thisguide, you will get a look intoPython type checking. Traditionally, types have been handled by thePython interpreter in a flexible but implicit way. Recent versions ofPython allow you to specify explicit type h

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