thanks for the help Andreas, i dont really need that much a const so i wont do anything like that to have a const like data. I am very used to java and c++, thats why i always used acess modifier, but i think i can live without it now i know that it dont exist in python :P.
On Thu, Mar 6, 2008 at 6:39 AM, Andreas Kostyrka <[EMAIL PROTECTED]> wrote: > The answer is slightly more complex. > > 1.) objects are either mutable or immutable. E.g. tuples and strings are > per definition immutable and "constant". Lists and dictionaries are an > example of the mutable kind. > > 2.) "variables", "instance members" are all only references to objects. > > Examples: > > # lists are mutable > a = [1, 2] > b = a > b.append(3) > assert a == [1, 2, 3] > > Now coming back to your question, that you want a non-changeable name, > well, one can create such a beast, e.g.: > > def constant(value): > def _get(*_dummy): > return value > return property(_get) > > class Test(object): > const_a = constant(123) > > This creates a member that can only be fetched, but not set or deleted. > > But in practice, I personally never have seen a need for something like > this. You can always overcome the above constant. Btw, you can do that > in C++ privates too, worst case by casting around and ending up with a > pointer that points to the private element ;) > > Andreas > > > Am Mittwoch, den 05.03.2008, 21:07 -0300 schrieb Tiago Katcipis: > > Its a simple question but i have found some trouble to find a good > > answer to it, maybe i just dont searched enough but it wont cost > > anything to ask here, and it will not cost to much to answer :-). I have > > started do develop on python and i really liked it, but im still > > learning. Im used to develop on c++ and java and i wanted to know if > > there is any way to create a final or const member, a member that after > > assigned cant be reassigned. Thanks to anyone who tries to help me and > > sorry to bother with a so silly question. i hope someday i can be able > > to help :-) > > > > best regards > > > > katcipis > > _______________________________________________ > > Tutor maillist - Tutor@python.org > > http://mail.python.org/mailman/listinfo/tutor >
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