(name)
return (
            len(name) > 4 and
            name[:2] == name[-2:] == '__' and
            name[2] != '_' and
            name[-3] != '_'
            )
Returns True if a __dunder__ name, False otherwise.
Returns True if a __dunder__ name, False otherwise.
Returns True if a __dunder__ name False otherwise .
def _is_dunder(name):
    """
    Returns True if a __dunder__ name, False otherwise.
    """
    return (
            len(name) > 4 and
            name[:2] == name[-2:] == '__' and
            name[2] != '_' and
            name[-3] != '_'
            )
def _is_dunder ( name ) : return ( len ( name ) > 4 and name [ : 2 ] == name [ - 2 : ] == '__' and name [ 2 ] != '_' and name [ - 3 ] != '_' )