[Python-Dev] slots and default values (original) (raw)

Duncan Booth duncan@rcp.co.uk
Tue, 13 May 2003 16:20:30 +0100

Aahz <aahz@pythoncraft.com> wrote in news:20030513141719.GA12321@panix.com:

On Tue, May 13, 2003, Raymond Hettinger wrote:

Was there a reason that slots makes initialized variables read-only? It would be useful to have overridable default values (even if it entailed copying them into an instance's slots): class Pane(object): slots = ('background', 'foreground', 'size', 'content') background = 'black' foreground = 'white' size = (80, 25) p = Pane() p.background = 'light blue' # override the default assert p.foreground == 'white' # other defaults still in-place Why not do the initializing in init?

The following works, but I can't remember whether you're supposed to be able to use a dict in slots or if it just happens to be allowed:

class Pane(object): slots = { 'background': 'black', 'foreground': 'white', 'size': (80, 25) } def init(self): for k, v in self.slots.iteritems(): setattr(self, k, v)

p = Pane() p.background = 'blue' p.background, p.foreground ('blue', 'white')

-- Duncan Booth duncan@rcp.co.uk int month(char *p){return(124864/((p[0]+p[1]-p[2]&0x1f)+1)%12)["\5\x8\3" "\6\7\xb\1\x9\xa\2\0\4"];} // Who said my code was obscure?