What you want is essentially : if parm_x is not supplied, use self.val_x
So why not just express it clearly at the very beginning of the function : def f(self, parm_x=NotSupplied, parm_y=NotSupplied ,,,) if parm_x is NotSupplied: parm_x = self.val_x if parm_y is NotSupplied: parm_y = self.val_y Much easier to understand than the "twisting your arm 720 degree in the back" factory method, IMO. Gregory Petrosyan wrote: > Thanks a lot, but that's not what I do really want. > 1) f() may have many arguments, not one > 2) I don't whant only to _print_ x. I want to do many work with it, so > if I could simply write > > def f(self, x = self.data) (*) > > it would be much better. > > By the way, using > > class A(object): > data = 0 > .... > def f(self, x = data) > > solves this problem, but not nice at all > > So I think (*) is the best variant, but it doesn't work :( -- http://mail.python.org/mailman/listinfo/python-list
