from typing import Dict


def _filter_out_none_values(dictionary: Dict) -> Dict:
    """Return copy of the dictionary, omitting all keys for which values are None.

    >>> _filter_out_none_values({"k1": "v1", "k2": None})
    {'k1': 'v1'}
    """
    return {k: v for k, v in dictionary.items() if v is not None}