I am working on a project with a relatively large code-base. And it has a history. Our team wrote some parts of it way before type-hints. And we steel add hints to the legacy code or improve them. Is it worth the fuss? Sure! Our users are developers. They open our code in PyCharm every day. And they hope that it will help them to solve their task as quickly as possible.

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Here is my small list of sources of type hints in Python that I use almost every day.

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Type hints are not mandatory in Python. So you can use them or not. If you decide work with them you’ll face many difficulties annotating functions or variables. This article shows my point of view on one specific case.

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