How do you write a django model that can crunch numbers and automatically populate another field with results?

[Mika]

There's a more detailed version of this question where I've embedded
graphics and explained my algorithm to make it more clear on
stackoverflow. I haven't gotten a response on it yet so I thought I
might come here and see if anyone can help me out.

http://stackoverflow.com/questions/10493279/how-do-you-write-a-django-model-that-can-automatically-normalize-data

In a nutshell, I'm putting together a music recommendation engine and
I need to store data about the different tracks in a sqlite database.
I've set it up so that you can easily add the data using the admin
interface. There's one particular piece of data for each track called
tfidf that's basically a sentiment score for the lyrics. I'm trying to
set up the model in such a way once you manually enter the tfidf value
of the track in admin, it automatically calculates a normalized value
for it. The algorithm basically just looks at the tfidf value of the
track and subtracts the smallest tfidf value of all the tracks in the
column from that. Then it divides that number by the difference of the
largest tfidf and the smallest tfidf values in the column. That gives
you a number between 0 and 1.

The problem is that django doesn't seem to have the methods that would
allow me to automatically select minimum and maximum tfidf values in a
table the way I could with SQL statements. Basically, to code this
algorithm, I need to be able to select minimum and maximum tfidf
values in a column, along with the tfidf value of the track, and then
it's just a matter of doing calculations. I'm pretty new to django and
am not fully aware of what it's capable of. The model for the table
I'm talking about is this:

class Party(models.Model):
song = models.CharField(max_length = 30)
tfidf = models.FloatField(max_length = 50)
normalized_tfidf = models.FloatField(max_length = 50)


Anybody have any idea what tools are available in django to
automatically take the tfidf data, do calculations on it, and then
automatically have the results populate the normalized_tfidf field?

thnx

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Can't get model to show up in admin interface

[Mika]

I'm working through James Bennet's Practical Django Projects 2nd
edition. I have a folder called "coltrane" which has a models.py file
with the following:

from django.db import models

class Category(models.Model):
title = models.CharField(max_length = 250)
slug = models.SlugField(unique = True)
description = models.TextField()

def__unicode__(self):
return self.title

I want to be able to manage this model through the admin interface so
I've added the folder name to the INSTALLED_APPS setting of the
project like so:

INSTALLED_APPS = (
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.admin',
'django.contrib.flatpages',
'coltrane',

)

Now I want to see it on the dev server, so I cd into the directory
that contains the INSTALLED_APPS setting and run python manage.py
syncdb to install the table. But I keep getting an error message that
reads "Error: No module named coltrane".

Any idea why this is happening?

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Template file not recognized for some strange reason

[Mika]

I'm working through one of the template examples in the django book
and the template file I created isn't being recognized for some reason
even though it's in the folder. The error report is at the bottom of
the page. The TEMP_DIRS variable is set to the correct file path in my
settings file:  TEMPLATE_DIRS = ("/Users/Documents/Music\ App/redlab/
templates",)
The view function is in order too:

from django.template.loader import get_template
from django.template import Context
from django.http import HttpResponse
import datetime
def current_datetime(request):
now = datetime.datetime.now()
t = get_template('current_datetime.html')
html = t.render(Context({'current_date':now}))
return HttpResponse(html)

The url file is also in order:

from django.conf.urls.defaults import*
from redlab.views import current_datetime
urlpatterns = patterns('', (r'^time/$', current_datetime))


And there is a current_datetime.html file in the templates directory
with the following code in it:
It is now {{ current_date }}.


But the file isn't being recognized for some reason. Please advise.
thnx.



Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/time/
Django Version: 1.3.1
Python Version: 2.7.2
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')

Template Loader Error:
Django tried loading these templates, in this order:
Using loader django.template.loaders.filesystem.Loader:
/Users/Documents/Music\ App/redlab/templates/current_datetime.html
(File does not exist)
Using loader django.template.loaders.app_directories.Loader:

Traceback:
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/
site-packages/django/core/handlers/base.py" in get_response
  111. response = callback(request,
*callback_args, **callback_kwargs)
File "/Users/mikaschiller/Documents/Music App/redlab/../redlab/
views.py" in current_datetime
  11.   t = get_template('current_datetime.html')
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/
site-packages/django/template/loader.py" in get_template
  157. template, origin = find_template(template_name)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/
site-packages/django/template/loader.py" in find_template
  138. raise TemplateDoesNotExist(name)

Exception Type: TemplateDoesNotExist at /time/
Exception Value: current_datetime.html


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Keep getting 404 error

[Mika]

I'm a total newbie to django and just started the book. I created a
project and I'm now trying to create my first page, but I keep getting
an error page that says:

Page not found (404)
Request Method: GET
Request URL:http://127.0.0.1:8000/
Using the URLconf defined in redlab.urls, Django tried these URL
patterns, in this order:
^hello/$
The current URL, , didn't match any of these.


Here's what's in my urls.py file:

from django.conf.urls.defaults import*
from redlab.views import hello

urlpatterns = patterns('', ('^hello/$', hello),)

# Uncomment the next two lines to enable the admin:
# from django.contrib import admin
# admin.autodiscover()
# Examples:
# url(r'^$', 'redlab.views.home', name='home'),
# url(r'^redlab/', include('redlab.foo.urls')),

# Uncomment the admin/doc line below to enable admin
documentation:
# url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

# Uncomment the next line to enable the admin:
# url(r'^admin/', include(admin.site.urls)),


please advise. thnx.

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Re: Problems creating django project in Windows 7

[Mika]

Thanks Jason. Putting python in front of 'django-admin' did work. I
appreciate your help with this.  I'm relatively new to Python and
programming in general. All I've ever used is Windows and I don't know
much about Linux-related operating systems. I'll probably go with
Ubuntu because it seems everyone who knows what they're doing is using
Linux(and Paul Graham mentions that just about all of Y Combinator's
startups use either Mac OSX or Linux). But I'm just curious about the
objective advantages of Ubuntu over Windows vis a vis django?Why would
Windows cause headaches down the road? Also, is VMWare or Virtualbox
necessary? How would it benefit my development environment?

thnx

On Mar 7, 12:35 pm, Jason <goodri...@gmail.com> wrote:
> Use python before all your commands. Even if you setup windows to
> automatically work without this, it's still a really good habit to get
> into.
>
> python django-admin.py
>
> My guess is that either will work or you have a problem with your
> python environment.
>
> Eventually you'll stop using Windows for Django development (I was
> like you once!). I suggest installing VirtualBox or VMWare (or
> whatever else) and do all this stuff from Ubuntu. It will save you
> many, many headaches.
>
> On Mar 6, 8:56 pm, Mika <schillerm...@gmail.com> wrote:
>
>
>
>
>
>
>
> > Hi,
> > I uninstalled and reinstalled django to see if that would solve
> > things, but I still can't create a project. Here are the steps I'm
> > taking:
>
> > 1) Made sure the correct path was set so that the command prompt can
> > find the django-admin.py file. Here's the path I set to locate the
> > appropriate folder:  %SystemRoot%\system32;%SystemRoot%;%SystemRoot%
> > \System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:
> > \Python26\;C:\Python26\Scripts
>
> > 2) Went into the command prompt and typed in django-admin.py. It
> > didn't automatically show me any of the available commands as I
> > presume it should have, but it didn't generate any error message
> > either.
>
> > 3) Typed in django-admin.py startproject mysite. I assumed I would
> > then be able to go find the newly created mysite folder in my home
> > directory because that's where it was set to start the project in the
> > prompt
>
> > 4) Went into my user directory(C:\Users\Mika) to find mysite folder,
> > but it wasn't there. I'm not getting any error messages at all either
> > in the command prompt, so I'm not sure what's going on. Please advise.
>
> > thnx
>
> > Mika

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Problems creating django project in Windows 7

[Mika]

Hi,
I uninstalled and reinstalled django to see if that would solve
things, but I still can't create a project. Here are the steps I'm
taking:

1) Made sure the correct path was set so that the command prompt can
find the django-admin.py file. Here's the path I set to locate the
appropriate folder:  %SystemRoot%\system32;%SystemRoot%;%SystemRoot%
\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:
\Python26\;C:\Python26\Scripts

2) Went into the command prompt and typed in django-admin.py. It
didn't automatically show me any of the available commands as I
presume it should have, but it didn't generate any error message
either.

3) Typed in django-admin.py startproject mysite. I assumed I would
then be able to go find the newly created mysite folder in my home
directory because that's where it was set to start the project in the
prompt

4) Went into my user directory(C:\Users\Mika) to find mysite folder,
but it wasn't there. I'm not getting any error messages at all either
in the command prompt, so I'm not sure what's going on. Please advise.

thnx

Mika

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Hi GQuery but for Django? Is somebody developing it?

[Mika Sjöman]

Hi

I was just super wowed by this Google Talk about GQuery (GWTQuery).
gwtquery.com

http://www.youtube.com/watch?v=sl5em1UPuoI

I am wondering if anyone is developing something similar for django? I
really hate Java and love python, but I love the idea of developing the
JQuery into the django code like they do with java and jquery (sort of) in
GQuery.
Also creating a new DjQuery, would mean that developers could stick to
writing the code inside their python code instead of having a second front
end language like JQuery. What do you guys think of the idea?

Cheers Mika

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Hi multilingual charfields?

[Mika Sjöman]

Hi

The content of my models have fields that need to be translated in the
django admin in several languages.

I found it to be a major hassle to get it working. Since django is having
internationalization built in, why does it not also allow you to easily mark
model fields for translation?

I think it should be built in to core since so many of us use multiple
languages in our webapps, so using it would be something like this:

1. import the multilang in models.py
2. flag specific fields for content translation
3. set the LANGUAGES in settings.py

What do you guys think?

// mika

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Re: Instructions for code changing to Django 1.3

[Mika Sjöman]

Hi

I missed out on that one, is it possible to see it online afterwards? I have
no problem paying the everbrite fee.

// mika

On Wed, Mar 30, 2011 at 10:17 PM, Shawn Milochik <sh...@milochik.com> wrote:

> It just so happens that there's a two-hour Webinar by Jacob
> Kaplan-Moss tomorrow on this very topic:
>
> http://www.eventbrite.com/event/1008507473
>
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>
>

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Re: Is there any Open Source Django Newspaper CMS?

[Mika Sjöman]

django-cms.org

//mika

On Wed, Mar 23, 2011 at 7:14 PM, Rehmetjan Tursun <
rehmetjan.tur...@gmail.com> wrote:

> I Googled many times, not a beautifull answer (except
> http://code.google.com/p/crimson-online/ ) Demo:
> http://www.thecrimson.com/
>
> Do you know others?
>

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Re: Is there any Open Source Django Newspaper CMS?

[Mika Sjöman]

Hi

What about trying google first before asking? Try to google>  Django cms.

// mika

On Wed, Mar 23, 2011 at 7:03 PM, Rehmetjan <rehmetjan.tur...@gmail.com>wrote:

> I mean a out-of-box ready for production newspaper CMS. thanks
>
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Re: Clueless Monk

[Mika Sjöman]

Hi

It is installed by default in Mac OS X since it is a unix system. No need to
install anything else than django - if you want that too will say. If you
wanna learn python programing, I can recommend TheNewBoston python tutorials
on youtube. Google it and you will find his videos.

You can run the python interpreter by opening up the Terminal app in the
/Applications/Utillities/ folder and just write pyton and hit enter.

happy coding!

//mika

On Wed, Mar 23, 2011 at 1:24 PM, Sadra Kasraian <mska...@gmail.com> wrote:

> I have a black Macbook with OS-X. I was wondering how do I start using it
> python. What do I download?
>
> On Tue, Mar 22, 2011 at 4:38 PM, Cal Leeming [Simplicity Media Ltd] <
> cal.leem...@simplicitymedialtd.co.uk> wrote:
>
>> Shawn is right, Python *is* awesome ^_^
>>
>> Soon you will be whispering sweet nothings to your IDE as your code just
>> gracefully glides along. But then, you will hit a glass window, and fall
>> swiftly to the ground with all the grace of a blind pigeon, whilst screaming
>> at your IDE because python/stackless is throwing memory errors or seg
>> faulting when you try implementing threads.
>>
>> It's at that point, that these mailing lists become *very* handy :D
>>
>> On Tue, Mar 22, 2011 at 8:28 PM, Shawn Milochik <sh...@milochik.com>wrote:
>>
>>> A good way to start is to go to the Python Web site, do the tutorial,
>>> and then graduate to the Python mailing list. Welcome to Python --
>>> it's awesome!
>>>
>>> This list is for Django, so this isn't on-topic for this list.
>>>
>>> Tutorial: http://python.org/doc/
>>>
>>> Mailing list: http://mail.python.org/mailman/listinfo/python-list
>>>
>>> Shawn
>>>
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>>>
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Re: Question about including views in base templates

[Mika J]

I see now what you mean. I can really use that.
Thanks for the answer!

Michael

2011/1/27 Shawn Milochik 

> I think you're looking for context processors.
>
>
> http://docs.djangoproject.com/en/dev/ref/templates/api/#writing-your-own-context-processors
>
> You write functions that add to the context each page receives. That info
> is available in the template regardless of which view called the rendering.
>
> Shawn
>
>
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Re: def __str__(self,):

[mika]

You could try
return str(self.name)
or
return '%i' % self.name

On 9/20/07, Greg <[EMAIL PROTECTED]> wrote:
>
> Do this method have to return a string?  I have the following model:
>
> class Price(models.Model):
> name = models.DecimalField(max_digits=6, decimal_places=2)
> price_cat = models.ForeignKey(PriceCategory)
>
> def __str__(self,):
>return self.name
>
> class Admin:
> pass
>
>
> //
>
> However, when I view this is the admin I get the following error:
> '__str__ returned non-string (type float)'.  Is there anyway to solve
> this problem?  Do I have to return a string?
>
> Thanks

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