def parse_bool(value):
    """Semi-blind boolean conversion that treats "False" and u"False"
    as False, not True. If fed a boolean, nothing happens and the
    value is returned as-is.

        >>> parse_bool("False")
        False
        >>> parse_bool("True")
        True
        >>> parse_bool(False)
        False
        >>> parse_bool(True)
        True
    """
    return bool({'True': True, 'False': False}.get(value, value))
