[Chicago] Using globals across files

Ian Bicking ianb at colorstudy.com
Wed Mar 29 00:06:09 CEST 2006

Jason Rexilius wrote:
> globals are not across-the-board bad.. abusing them is bad (which
> happens often enough for people to get the idea that they are bad)
> but there are times when a truly global variable (like a counter) is
> usefull.
> I am surprised that this type of construct doesn't exist in Python..

Here's how I'd do a counter:

# in some_module.py
import itertools
my_counter = itertools.count()

# in another_module.py
from some_module import my_counter

def foo():
     next_value = my_counter.next()

This solves several threading and binding problems that might bite you 
later.  In Python there's no real global-everywhere variables, for 
several reasons besides "globals are bad"; the badness of globals is 
actually low on the scale of reasons IMHO.

Ian Bicking  /  ianb at colorstudy.com  /  http://blog.ianbicking.org

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