How to inspect all ClassVar inside class?

Question

I have a Python class like the below:

from typing import ClassVar

class Foo:
    bar: ClassVar[int] = 1
    
    def __init__(self):
        self.spam: int = 2

How can I inspect this class Foo to get the ClassVars and their values?

I am looking for something like {"bar": 1}, and need this to work for Python 3.8+.

Answer 1

You can do it by inspecting the class' __annotations__ dictionary.

from typing import ClassVar

class Foo:
    bar: ClassVar[int] = 1

    def __init__(self):
        self.spam: int = 2

for attr, cls in Foo.__annotations__.items():
    print(f'{attr=}, {cls=}, value={getattr(Foo, attr)}')

Output:

attr='bar', cls=typing.ClassVar[int], value=1