modifying locals

[John [H2O]]

I would like to write a function to write variables to a file and modify a
few 'counters'. This is to replace multiple instances of identical code in a
module I am writing. 

This is my approach:

def write_vars(D):
    """ pass D=locals() to this function... """
    for key in D.keys():
        exec("%s = %s" % (key,D[key]))

    outfile.write(...)
    numcount += 1
    do this, do that...

the issue is that at the end, I want to return outfile, numcount, etc... but
I would prefer to not return them explicitly, that is, I would just like
that the modified values are reflected in the script. How do I do this?
Using global? But that seems a bit dangerous since I am using exec.

Bringing up another matter... is there a better way to do this that doesn't
use exec?

Thanks!

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