Type Annotations
PEP 484 introduced type hints (typing module), a.k.a type annotations. While its main focus was function annotations, it also introduced the notion of type comments to annotate variables.
Ex: primes = [] #type: List[int]
Although type comments work well enough, there are some downsides:
- text editors highlight comments differently
- one can’t annotate uninitialized variables
- mixing type comments with normal ones is confusing
The solution: Variable Annotations
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As I strive to become a better python programmer, I’ve started using type hints and created this intro guide
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