Declare a variable global

[yinglcs at gmail.com]

Hi,

I have the following code:

colorIndex = 0;

def test():
     print colorIndex;

This won't work.   But it works if i do this:

colorIndex = 0;

def test():
     global colorIndex;
     print colorIndex;

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()'?

Thank you.