from xx import yy

[bvdp]

On Sunday, November 12, 2017 at 7:18:04 PM UTC-7, bvdp wrote:
> I'm having a conceptual mind-fart today. I just modified a bunch of code to use "from xx import variable" when variable is a global in xx.py. But, when I change/read 'variable' it doesn't appear to change. I've written a bit of code to show the problem:
> 
> mod1.py
> myvar = 99
> def setvar(x):
>     global myvar
>     myvar = x
> 
> test1.py
> import mod1
> mod1.myvar = 44
> print (mod1.myvar)
> mod1.setvar(33)
> print (mod1.myvar)
> 
> If this test1.py is run myvar is fine. But, if I run:
> 
> test2.py
> from mod1 import myvar, setvar
> myvar = 44
> print (myvar)
> setvar(33)
> print (myvar)
> 
> It doesn't print the '33'.
> 
> I thought (apparently incorrectly) that import as would import the name myvar into the current module's namespace where it could be read by functions in the module????

Thanks all for confirming that I was wrong to use "from .. import". Hmmm, perhaps for functions it might be okay. But, in most cases it's a lot more obvious to use module.function() when calling. Maybe a bit slower, but I'm sure it's negligible in most cases.

And, yes, I am trying to share state info between modules. Is this a bad thing? I guess I would write getter() and setter() functions for all this. But that does seem to remind me too much of some other language :)