from typing import Mapping
from typing import Any


def is_nested(dictionary: Mapping[Any, Any]) -> bool:
    """Returns if passed 'contents' is nested at least one-level.

    Args:
        dictionary (dict): dict to be tested.

    Returns:
        bool: indicating whether any value in the 'contents' is also a
            dict (meaning that 'contents' is nested).

    """
    return any(isinstance(v, dict) for v in dictionary.values())