(obj, attr)
return [obj, Node(syms.trailer, [Dot(), attr])]
A node tuple for obj.attr
A node tuple for obj.attr
A node tuple for obj . attr
def Attr(obj, attr):
    """A node tuple for obj.attr"""
    return [obj, Node(syms.trailer, [Dot(), attr])]
def Attr ( obj , attr ) : return [ obj , Node ( syms . trailer , [ Dot ( ) , attr ] ) ]