Here is my reason: I have an object that contrains a 2D regular grid (matrix). In this regular grid, I place points at regular intervals. In essence, i have something like (my code is obviously more complex, this is just to show what I want to do)
obj.grid = numpy.zeros( ( 100, 100 ) ) obj.grid[ obj.y1: obj.y2 : obj.ys, obj.x1 : obj.x2 : obj.xs ] = embedded_parameters result = somefunc( obj.grid ) My goal was to reduce the number of elements in my obj object by replacing y1, y2, ys, and x1, x2, xs by 2 slice objects, and then do: obj.grid[ obj.slicey, obj.slicex ] = embedded_parameters But when I do this and then try to deepcopy my object, it doesn't work, as in the example below. Its not a big thing. I just liked the idea of having less elements in my obj class and actually modeling my slice concept by a slice object, specially since i'm going to 3D and 4D grid, and its somewhat annoying to carry so many indices in my class definition. Simon Forman wrote: > Alexandre Guimond wrote: > > Hi all, > > > > i'm trying to deepcopy a slice object but i get the following error. > > Does anyone know a workaround? > > > > ActivePython 2.4.3 Build 12 (ActiveState Software Inc.) based on > > Python 2.4.3 (#69, Apr 11 2006, 15:32:42) [MSC v.1310 32 bit (Intel)] > > on win32 > > Type "help", "copyright", "credits" or "license" for more information. > > >>> import copy > > >>> copy.deepcopy( slice( 1, 10, 2 ) ) > > Traceback (most recent call last): > > File "<stdin>", line 1, in ? > > File "C:\Program Files\Python\lib\copy.py", line 204, in deepcopy > > y = _reconstruct(x, rv, 1, memo) > > File "C:\Program Files\Python\lib\copy.py", line 336, in _reconstruct > > y = callable(*args) > > File "C:\Program Files\Python\lib\copy_reg.py", line 92, in > > __newobj__ > > return cls.__new__(cls, *args) > > TypeError: slice expected at least 1 arguments, got 0 > > > > thx for any help. > > Why would you want to [deep]copy a slice object? > > Anyway, I don't know much about them, other than that they are > slightly unusual objects that play a very restricted role in python, > rather like the Ellipsis. > > Workarounds are possible, I think, but really you almost certainly > don't need to do this. > > Peace, > ~Simon -- http://mail.python.org/mailman/listinfo/python-list
