Re: Performance & import

From: David Abrahams (gclbb-jamboost_at_[hidden])
Date: 2003-06-11 15:33:49

Vladimir Prus <ghost_at_[hidden]> writes:

> David Abrahams wrote:
>
>> > BTW, what's the motivation for
>> >
>> > import uitls/path ;
>> >
>> > style, as opposed to
>> >
>> > import path ;
>> >
>> > Better indication of what layer we're using?
>>
>> The motivation is basically the same as for Python packages. Systems
>> grow. We're going to allow users to write modules with arbitrary
>> names, and eventually we'll almost certainly want to use the same
>> module name in two different layers.
>
> I see. OTOH, long module names are not required in Python. Usually, you write
>
> import popen ;

Very nice for libraries in the standard distro. Not so nice
otherwise.

> and only for special package something like 
>
> import xml.dom ;
>
>> > I'm thinking that if string layering is to be enforced, we can allow
>>
>> string layering?
>
> "strict layering" --- i.e. when modules from one layer can only import modules 
> from the layer below.

I didn't plan to ever add that kind of enforcement, but it seems like
a reasonable thing to issue warnings about.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com