[wxPython-users] Accessing Variable Across Modules

[Christopher Barker]

Rich Shepard wrote:
>   Interestingly enough, I stumbled into the middle of a thread on the 
> python
> mail list that addressed this exact issue. I created a new module,
> config.py, that contains only "projname = ' '." By importing config in all
> files needing that variable, it's made available to them.
> 
>   This is, apparently, the same approach used by the 'singleton pattern' 

yup. You could google it, but essentially, the 'singleton pattern' is 
simply when you have a class that there is designed to be only a single 
instance of.

In Python, everything is about namespaces. A class, a class instance, a 
module -- they are all simply different namespaces, with slightly 
different rules about how names are resolved.

I use a Config.py module quite frequently in my code. However, I usually 
put a few classes in it to hold different types of information, rather 
than putting it all in the global namespace. That also makes it easier 
to have methods (or properties) to set values. If you put them all in 
the module global namespace , you have to make the attributes global to 
set them.

-Chris



-- 
Christopher Barker, Ph.D.
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