Delete key from nested dictionary

del_key.py

def delete(key, dict_obj):
    """Deletes element from dict_obj accessing by complex key

    Args:
        key (str): Complex key to your value (separated by dots)
        dict_obj (dict): Your dictionary

    Raises:
        KeyError: if object doesn't contain key

    Example:
        >>> d = {
                'a': 2,
                'b': {
                    'c': {'d': 3},
                    'd': {
                        'e': 5,
                        'f': 7,
                    },
                },
            }

        >>> delete('b.d.e', d)
        >>> print(d)
        {
            'a': 2,
            'b': {
                'c': {'d': 3},
                'd': {'f': 7},
            },
        }
    """
    key, *tail = key.split('.', 1)
    if tail:
        delete(tail[0], dict_obj[key])
    else:
        del dict_obj[key]