Declare a variable global

[Bruno Desthuilliers]

yinglcs at gmail.com a écrit :
> Hi,
> 
> I have the following code:
> 
> colorIndex = 0;

You don't need the ;

> 
> def test():
>      print colorIndex;

Idem.

> This won't work.

Why ?

Or more exactly : for which definition of "won't work" ? (hint: this 
code prints 0 on sys.stdout - I don't know what else you where expecting...)

>   But it works if i do this:
> 
> colorIndex = 0;
> 
> def test():
>      global colorIndex;
>      print colorIndex;

Have mercy : keep those ; out of here.

> My question is why do I have to explicit declaring 'global' for
> 'colorIndex'?  Can't python automatically looks in the global scope
> when i access 'colorIndex' in my function 'test()'?

It does. You only need to declare a name global in a function if you 
intend to rebind the name in the function.