On Sun, 08 Oct 2006 12:25:10 +0200, IloChab wrote: > I'd like to implement an object that represents a circular counter, i.e. > an integer that returns to zero when it goes over it's maxVal.
[snip] > The python problem that I give you it's about style. > I'd like to write in my code something that looks almost like using an > integer object. > > I mean, I'd like to write: > > cnt = CircularConter(maxVal=100, initialVal=10) > cnt += 100 # cnt value is 9 > print cnt # prints 9 > 100 > cnt # is false All this is perfectly sensible. > cnt = 100 # cnt new value is 100 [NOT rebind cnt with 100] This is not possible. Names like cnt are just labels, they don't have behaviour. Objects have behaviour; but objects don't and can't know what name or names they are assigned to. [snip] > The fact is that I don't like to write cnt.set(100) or > cnt = CircularConter(100, 100) instead of cnt = 100. How do you expect the Python compiler to know you want a CircularConter instance if you just write 100? (By the way, in English, the correct spelling is counter, not conter.) > So I thought that property or descriptors could be useful. > I was even glad to write: > > cnt = CircularConterWithProperty(maxVal=100, initialVal=10) > cnt.val += 100 > print cnt.val > 100 > cnt.val # is false > cnt.val = 100 > > just to give uniformity to counter accessing syntax. > But I wasn't able to implement nothing working with my __cmp__ method. __cmp__ is for CoMParisons, not binding names to objects. -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
