thanks, éthat's really an awesome explanation. thanks 2010/9/10 Tom Evans <[email protected]>
> On Fri, Sep 10, 2010 at 1:05 AM, Bachir <[email protected]> wrote: > > The problem is not the lack of information, the real problem is that i > don't > > know what to search for . > > > > 2010/9/9 bruno desthuilliers <[email protected]> > >> > >> > >> On 9 sep, 03:46, maroxe <[email protected]> wrote: > >> > Hi, I am trying to understand an other magic thing about django: it > >> > can convert strings to modules. In settings.py, INSTALLED_APPS is > >> > declared like that: > >> > > >> > INSTALLED_APPS = ( > >> > 'django.contrib.auth', > >> > 'django.contrib.contenttypes', > >> > 'django.contrib.sessions', > >> > ) > >> > All it contains is strings. But django will convert those strings to > >> > modules and import them later. > >> > > >> > I want to do be able to do the same thing. but i don't know how. > > Well, OK. Lets break down how one could find this out, because you > *did* have everything you needed to find this out yourself. > > You wanted to turn a string into a module name, so you can import from it. > You noticed that django does the same thing with the setting > INSTALLED_APPS. > You have the django source code. > > So, the first thing to do is to search the django source code for > INSTALLED_APPS. > For this, I tend to use "ack", which is like grep but better for > programmers. > This returns lots of files - its used in lots of places. Look at the > list of files returned and choose one that looks appropriate to look > at. > > I chose "core/management/commands/syncdb.py", as I knew this file is > responsible for creating db models - its the code that runs when you > run ./manage.py syncdb. > > Looking at how INSTALLED_APPS is used in that file: > > > for app_name in settings.INSTALLED_APPS: > > try: > > import_module('.management', app_name) > > except ImportError, exc: > > Ah, so theres a function called import_module. Where does that come from? > > > from django.utils.importlib import import_module > > Ah, so now I know how it does it's import magic, and I know how to > import it myself. I can now play around with this in the shell, so I > know I have the usage right: > > >>> from django.utils.importlib import import_module > >>> mod = import_module('math') > >>> mod.ceil > <built-in function ceil> > > There, not so hard, is it? You did know what to search for, as you > included it in your original question.. > > Cheers > > Tom > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<django-users%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
