Using variables across modules

Fredrik Lundh fredrik at pythonware.com
Wed Jul 23 21:52:46 CEST 2008


Aaron Scott wrote:

> I'm having some trouble understanding how Python handles variables
> across multiple modules. I've dug through the documentation, but I
> still find myself at a loss.
> 
> When you import a module, are you creating an instance of the
> variables within? For instance, if I have one file, "variables.py",
> which contains "myvar = 0", and I import it into both "foo.py" and
> "bar.py" with the line "from variables import *", and then set myvar
> in "foo.py" and "bar.py" to different values, will each file have a
> different value for myvar? If so, how can I ensure that a change to
> myvar in "bar.py" is reflected by "foo.py"? Or am I completely off
> base?

first read this to learn how objects and variables work in Python:

     http://effbot.org/zone/python-objects.htm

and then read this to learn how from-import works, and when you're 
supposed to use it:

     http://effbot.org/zone/import-confusion.htm

hope this helps!

</F>




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