Return 'Single' or 'Double' depending on what kind of string this is.

def _get_string_type_from_token(token_type):
    """Return 'Single' or 'Double' depending on what kind of string this is."""
    return_value = None
    if token_type in [TokenType.BeginSingleQuotedLiteral,
                      TokenType.EndSingleQuotedLiteral]:
        return_value = "Single"
    elif token_type in [TokenType.BeginDoubleQuotedLiteral,
                        TokenType.EndDoubleQuotedLiteral]:
        return_value = "Double"

    assert return_value is not None
    return return_value