Imports awareness in Imported modules problem

[Mohamed Yousef]

On Sun, Aug 24, 2008 at 2:27 PM, alex23 <wuwei23 at gmail.com> wrote:
> On Aug 24, 8:34 pm, "Mohamed Yousef" <harrr... at gmail.com> wrote:
>> and sys  ,string.. etc add them all twice or four / n times ?
>> remove one and then forget to remove one of them in a file and start
>> debugging ... this really doesn't look to be a good practice
>
> No, having each module contain all of the necessary imports for itself
> -is- good practice.
>
> While it might seem more convenient to define all of your imports in
> one place, what you're really doing is injecting -all- references to -
> all- imported items into -every- module. Having a global soup of
> imported items like such is much, much harder to control for
> unexpected name conflicts.
>
> Ideally, you want each module's namespace to -only- contain references
> to the external entities it's actually using. This not only makes each
> module self-contained and more open to independent re-use, it makes
> them -incredibly- easier to debug.
>
> Please don't confuse temporary convenience with good practice.
mm , this seems to be logically or another good behind logic . as PHP
already uses that convention -from which i thought python also does -

but what about module-wide variables what is the approach to them ,
will i have to store them in a memory table (SQL) , or keep passing
them between objects - which i really hate -