On 06/03/2008, Tiago Katcipis <[EMAIL PROTECTED]> wrote: > 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 :-)
The short answer is: "Not really". Actually, with recent versions of python, you could do something with properties. e.g.: >>> class MyClass(object): ... def fget_FOO(self): ... return 'foo' ... FOO = property(fget=fget_FOO) ... >>> x = MyClass() >>> x.FOO 'foo' >>> x.FOO = 'bar' Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: can't set attribute property() takes up to three arguments: get, set, and docstring. In this case, I omitted the setter. Thus python doesn't allow me to set that attribute. You could also mess around with getattr() to achieve a similar effect. Generally, though, python takes the attitude that programmers are adults capable of thinking for themselves, and if you're silly enough to reassign a constant, you deserve whatever you get. Best just to make your variable names ALL_CAPS and write documentation saying they're constant :-) See also this recipe: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65207 for another take on the issue. -- John. _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
