Python added syntax for \ something called Variable Annotation in version 3.6. Variable Annotation is basically an enhancement of type hinting, which was introduced in Python 3.5. The full explanation behind Variable Annotation is explained in PEP 526. In this article, we give have a quick refresher on type hinting and then introduce the new Variable Annotation syntax. What's Type Hinting? Type hinting in Python is basically declaring that the parameters in your functions and methods have a certain type. Python does not enforce the type "hints," but you can use tools like mypy to enforce the type hints in much the same way that C++ enforces type declarations at runtime. Let's look at a normal function with no type hints added:


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