Type Check

python is dynamic typed language so we can't always specify our variable time at compile time. python decide variable type at runtime.
but newer version of python has feature call type hints
refer : https://docs.python.org/3/library/typing.html
using type hints we can specify our variable types at compile time, this won't affect our python code but this will help a lot for documentation, code autocomplete and find out type error at compile time
so to help with our type checking python has separate library called mypy
refer : https://pypi.org/project/mypy/

pip install mypy
use mypy pythonfile.py command to run type check using command prompt
with visual studio you can automatically run it live, open command tool and type python linter this will allow you to set mypy as python linter
after doing that you will be able to see problems related to types in vs code problem tab