"""
A simple utility to import something by its string name.
"""

# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from __future__ import annotations

from typing import Any


def import_item(name: str) -> Any:
    """Import and return ``bar`` given the string ``foo.bar``.

    Calling ``bar = import_item("foo.bar")`` is the functional equivalent of
    executing the code ``from foo import bar``.

    Parameters
    ----------
    name : string
        The fully qualified name of the module/package being imported.

    Returns
    -------
    mod : object
        The imported object: for a dotted name ``foo.bar``, the ``bar``
        attribute of module ``foo`` (which may be any object); for an
        un-dotted name, the module itself.
    """
    if not isinstance(name, str):
        raise TypeError(f"import_item accepts strings, not '{type(name)}'.")
    parts = name.rsplit(".", 1)
    if len(parts) == 2:
        # called with 'foo.bar....'
        package, obj = parts
        module = __import__(package, fromlist=[obj])
        try:
            pak = getattr(module, obj)
        except AttributeError as e:
            raise ImportError(f"No module named {obj}") from e
        return pak
    else:
        # called with un-dotted string
        return __import__(parts[0])
