On Tue, Mar 31, 2009 at 1:26 PM, Henryk Trappmann <bo198...@googlemail.com> wrote: > > On Mar 31, 4:35 pm, William Stein <wst...@gmail.com> wrote: >> Note that callable objects are fine as >> attributes (e.g., objects with a __call__ method defined). > > Actually I dont see how to get it to work: > I want to give a function as initialization parameter to > FormalPowerSeries. > This function needs to be stored somewhere. > If I store it inside a callable object then the callable object can > not be pickled. > I think the ability to give a function as parameter to > FormalPowerSeries is a must. > I dont want the user to declare a class that contains the function as > __call__ method and then give an instance of this class as parameter > to FormalPowerSeries (pickling would work in this case.) > > Can we circumvent this?
If the user gives a Python function, then the object they made cannot be pickled. If they give a Python object with a __call__ method, then the power series *can* be pickled. Just make sure that it can be when they give an appropriate input, and give docstrings and documentation to explain this subtle issue. It's not a rule that every possible thing in Sage can be pickled -- e.g., open file handles can't be pickled. However, I just want to make sure that if I want to make pickleable power series and I jump through the hoop of making the coefficient function a callable object that can be pickled, then everything else works. OK? William --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
