When do default parameters get their values set?

[bSneddon]

I ran into an issue setting variables from a GUI module that imports a back end module.  My approach was wrong obviously but what is the best way to set values in a back end module.

#module name beTest.py

cfg = { 'def' : 'blue'}

def printDef(argT = cfg['def']):
	print argT
 

#module name feTest
import beTest

beTest.cfg['def'] = "no red"
beTest.printDef()



This prints blue.      I suppose because I am changing a local copy of cfg dictionary.  What is the write approach here?


Thanks

Bill