On 13 Jan 2005 07:18:26 EST, Tim Daneliuk <[EMAIL PROTECTED]> wrote: > I am a bit confused. I was under the impression that: > > class foo(object): > x = 0 > y = 1 > > means that x and y are variables shared by all instances of a class. > But when I run this against two instances of foo, and set the values > of x and y, they are indeed unique to the *instance* rather than the > class.
I can see why you might think that: >>> class Spam(object): ... eggs = 4 ... >>> spam = Spam() >>> spam2 = Spam() >>> spam.eggs 4 >>> spam2.eggs 4 >>> spam.eggs = 2 >>> spam.eggs 2 >>> spam2.eggs 4 But you are being mislead by the fact that integers are immutable. 'spam.eggs = 2' is *creating* an instance member - there wasn't one before. Have a look at what happens with a mutable object: >>> class Spam(object): ... eggs = [3] ... >>> spam = Spam() >>> spam2 = Spam() >>> spam.eggs [3] >>> spam2.eggs [3] >>> spam.eggs.append(5) >>> spam.eggs [3, 5] >>> spam2.eggs [3, 5] -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
