myenv/lib/python3.10/site-packages/av/dictionary.pyi

from collections.abc import MutableMapping
from typing import Iterator

class Dictionary(MutableMapping[str, str]):
    def __getitem__(self, key: str) -> str: ...
    def __setitem__(self, key: str, value: str) -> None: ...
    def __delitem__(self, key: str) -> None: ...
    def __len__(self) -> int: ...
    def __iter__(self) -> Iterator[str]: ...
    def __repr__(self) -> str: ...