Hi Stephane, I think it is a great idea. The lambda trick means I don't have to make any changes at all to switch between my development environment and production. A real life example from a current project:
-----
from os.path import abspath, dirname, join
APP_PATH = lambda *x: abspath(join(dirname(__file__), *x))
MEDIA_ROOT = APP_PATH('webroot', 'media')
TEMPLATE_DIRS = (
APP_PATH('templates'),
)
-----
Note the * on the definition for x which means you only need one lambda.
On my production machines, the websites typically run from
/home/httpd/<domain>
but on my development machine (my laptop), they run from
/home/darryl/devel/websites/<customer>/<domain>
Cheers
Darryl
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