Beginners question

[Albert Hopkins]

On Fri, 2009-07-17 at 21:42 -0400, Ronn Ross wrote:
> How do you define a global variable in a class.

I bit of a mix-up with words here.  A variable can be a class variable
or a global variable (wrt the module).. not both.

>  I tried this with do success:
> class ClassName:
>     global_var = 1
>     
>     def some_methos():
>         print global_var
> 
> This doesn't work. What am I doing wrong?

You could have posted the error message... Two things are wrong here.
The first, if some_methos() is a method of ClassName then it should have
at least one parameter, which is the instance of the class (i.e.
"self"), so

    def some_methos(self):

The second problem is that global_var is not local so you need to
specify the scope.  You can either use

    print ClassName.global_var

or

    print self.global_var

I'm not sure which one is better though I prefer the former because it
makes it clearer to the reader that it's a class variable and not an
instance variable.

HTH,
-a