from typing import Any


def fqname_for(obj: Any) -> str:
    """
    Returns the fully qualified name of ``obj``.

    Parameters
    ----------
    obj
        The class we are interested in.

    Returns
    -------
    str
        The fully qualified name of ``obj``.
    """

    if "<locals>" in obj.__qualname__:
        raise RuntimeError(
            "Can't get fully qualified name of locally defined object. "
            f"{obj.__qualname__}"
        )

    return f"{obj.__module__}.{obj.__qualname__}"