Hi It is possible to declare some variables as int, long... ? , or something like visual basic option explicit. In some situations could be usefull. Thanks
|Thus Spake Luis Solís On the now historical date of Mon, 05 Jan 2004 08:23:56 +0000|
> Hi > It is possible to declare some variables as int, long... ? , or something > like visual basic option explicit. > In some situations could be usefull. > Thanks
Well, in python, that is left to programmer's discretion. Once you get used to it, it's less of a hassle and danger zone than you'd expect.
As a fallback, you can always use the isinstance() and type() functions to check what type of variable you have on hand.
Generally, isinstance is what you want to use because it returns true for subclasses. If the subclass doesn't do everything you'd expect of it's superclass, then either your or the subclass writer have broken their contract.
If you absotively posolutely must know that a variable is a certain class, not a subclass and nothing but the bona fide variable type you expected, then use type(). This, however, is seldom the case because using type() could prevent future programmers from extending your code.
p.s. The python-tutor list is probably a better place to ask questions like this. You're most likely to get helpful answers to questions about the basics than you are here.
-- Never forget the halloween documents. http://www.opensource.org/halloween/ """ Where will Microsoft try to drag you today? Do you really want to go there?"""
> "Variable" is a bad word - beurk ! - In Python there are ref-on-objects ; > it's without interest with declaration (explicit).
I'm not sure how helpful that is to a newbie, and in any case I've been using Python for a reasonably long time now and I definitely refer to those babies as variables.... with no ill effects to date.
Samuel Walters <swalters_use...@yahoo.com> wrote in message <news:pan.2004.01.05.21.05.32.783610@yahoo.com>... > |Thus Spake Luis Solís On the now historical date of Mon, 05 Jan 2004 > 08:23:56 +0000|
> > Hi > > It is possible to declare some variables as int, long... ? , or something > > like visual basic option explicit. > > In some situations could be usefull. > > Thanks
> Well, in python, that is left to programmer's discretion. > Once you get used to it, it's less of a hassle and danger zone than you'd > expect.
The main reason for this is that, in Python, using an unassigned variable gives you a friendly NameError. In BASIC, it implicitly creates a new variable (with a value of zero) whether you wanted it to or not.
...
> As a fallback, you can always use the isinstance() and type() functions to > check what type of variable you have on hand.
Or more accurately, what type of *object* you have on hand.
