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Using type annotations for the view parameters and results is a cool idea, I like it!

(Also, you might want to add "Show HN:" to the title (https://news.ycombinator.com/showhn.html))

Thank you! I updated the title. I think type annotation in Python3 is a great. And I thought there is a usage other than typing checking using mypy, so I try to convert url variables using the type information of function annotations.
Python 3 is definitely a political topic judging from how it gets treated around here. Get it off HN.