Comments to document attributes

Putting backwards compatibility aside, I think it would’ve been best to have item-scoped docstring BEFORE each item with slightly modified syntax from normal comments:

#! doc for a type alias
type MyT = str

#! doc for a function
def func(
    #! doc for an argument
    a: str,
    #! this one too
    b: int

#! doc for a class
#! can be multi lines
class MyClass:
    #! doc for a field
    field: str

(This is a different topic but if this was synthetically available, it would’ve also been useful for ORM libraries as you can imagine.)

That already exists in Sphinx. You can either use #: doc... comments above a name, or """doc...""" strings below a name.