Allows one to obtain all concrete generic type arguments for any Python type.

get_args_improved.py

from typing import List, Sequence, get_args


def get_args_all(t: type) -> List[type]:
    all_args: List[type] = []
    all_args.extend(get_args(t))
    try:
        orig_bases = t.__orig_bases__
    except AttributeError:
        pass
    else:
        for x in orig_bases:
            all_args.extend(get_args_all(x))
    return all_args

from typing import TypeVar, Generic, get_args

from get_args_improved import get_args_all


A = TypeVar('A')
B = TypeVar('B')


class F(Generic[A,B]):
  pass

print(f"{get_args(F)=}")      # ()
print(f{"get_args_all(F)=}")  # [~A, ~B]

print(f"{get_args(F[float,float])=}")      # (float, float)
print(f"{get_args_all(F[float,float])=}")  # [float, float]


class D(F[int,str]):
  pass

print(f"{get_args(D)=}")      # ()
print(f{"get_args_all(D)=}")  # [int, str]

print(f"{get_args(D())=}")      # ()
print(f{"get_args_all(D())=}")  # [int, str]