Suppose I define a class: class Foo(object): # children = [] # def __init__(self, *args, **kw): if kw: self.__dict__.update(kw) if args: self.chidlren = list(args) In current syntax I have to write the folowing "initialization" code: foo = \ Foo( Foo( Foo(x=3,y=4), Foo(x=5,y=6), x=4, y=5 ), x=1, y=2 ) I can't write this code as follows (it seems more natural for me): foo = \ Foo( x=1, y=2, Foo( x=4, y=5, Foo(x=3,y=4), Foo(x=5,y=6)) ) ) Would be desirable to allow two equivalent forms of calling syntax in python: <caller>(, ) and <caller>(, ) ? Best regards, Zaur