In order to store key-value pairs in Python, you can use the dictionary data structure. The dictionary functions in a similar fashion to the Python list, in that it is a collection of data.

In Python, however, there's no need to define a type. You can just use the variable name and the initial value. Python automatically figures out what your variable type is supposed to be.

Why Python type hints won’t save us. Python’s recently added type hinting system doesn’t really help here, either. It’s only intended to be used as an ahead-of-time linting tool, ...

Python, for all its power and popularity, has long lacked a form of flow control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.