Do you mean the type annotations that Python has had for about ten years?

And the typing library that uses them to specify type hints to compilers and other tooling?
https://docs.python.org/3/library/typing.html

On Wed, Aug 26, 2020 at 11:07 AM <krishnans2006@gmail.com> wrote:
One suggestion I had for the next Python release is to add type-implication support. Many developers have learned Python, but do not want to use it since it is slow. An awesome way to fix this is to have optional type-implications. For example, if you know for sure that variable x is an int, you can make Python just a bit smaller by somehow specifying to the interpreter that the variable is an integer. Something like 'x::int = 5'. By having optional type implications, you can still do everything you do with normal Python, except you can speed it up a little bit by telling the Interpreter that this variable is starting off with this datatype.
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