Help on object scope?

[Hendrik van Rooyen]

 "hg" <hg at nospam.org> wrote:


> bmaron2 at hotmail.com wrote:
> 
> > Hello everybody,
> > 
> > I have a (hopefully) simple question about scoping in python. I have a
> > program written as a package, with two files of interest. The two
> > files are /p.py and /lib/q.py

Make a third file for all the system wide globals, say param.py:

global r
r = 42

> > 
> > My file p.py looks like this:
> > 
> > ---
> > 
> > from lib import q
> > 
> > def main():

from param import *

> >   global r
> >   r = q.object1()
> >   s = q.object2()
> > 
> > if __name__ == "__main__":
> >   main()
> > 
> > ---
> > 
> > My file q.py in the subdirectory lib looks like this:

from param import *

> > 
> > class object1:
> >   t = 3
> > 
> > class object2:
> >   print r.t
> > 
> > ---
> > 
> > Python gives me an error, saying it can't recognize global name r.
> > However I define r as global in the top-level main definition! Can
> > anyone suggest how I can get around this, if I want to define and bind
> > global names inside of main() which are valid in all sub-modules?
> > 
> > Thanks very much for your help!
> 
> Might be wrong, but globals can only be global to the module they're
> declared in.

Correct.

> 
> I suggest you find another way such as passing your object as a parameter

or make the third file and import it everywhere you need them...

- Hendrik