from typing import List


def _parse_csv(s: str) -> List[str]:
    """Return the values of a csv string.

    >>> _parse_csv("a,b,c")
    ['a', 'b', 'c']
    >>> _parse_csv(" a, b ,c ")
    ['a', 'b', 'c']
    >>> _parse_csv(" a,b,c ")
    ['a', 'b', 'c']
    >>> _parse_csv(" a,")
    ['a']
    >>> _parse_csv("a, ")
    ['a']
    """
    return [s.strip() for s in s.split(",") if s.strip() != ""]