You can also do:

    if not RealEstateListing.objects.filter(slug_url=slug).exists():
        # do stuff...

Sometimes it&#39;s more clear to use `try: except:` block and other times one-liner `exists()` makes the code looking clearer... all depends on your application logic. 


I would not use the 404 wrapper if you aren&#39;t given a 404. That is misuse of intent. Just catch the DoesNotExist, instead.

    try:
        listing = RealEstateListing.objects.get(slug_url=slug)
    except RealEstateListing.DoesNotExist:
        listing = None

    listing = RealEstateListing.objects.filter(slug_url=slug).first() 

I would do it as simple as follows:

```
listing = RealEstateListing.objects.filter(slug_url=slug)
if listing:
    # do stuff
```

I don&#39;t see a need for try/catch. If there are potentially several objects in the result, then use first() as shown by user Henrik Heino

I have a &quot;setup&quot; script which I run in the morning which starts all the programs that I need. Now some of those need additional setup of the environment, so I need to wrap them in small BAT scripts.

How do I run such a script on Windows XP in the background?

`CALL env-script.bat` runs it synchronously, i.e. the setup script can continue only after the command in the env-script has terminated.

`START/B env-script.bat` runs another instance of CMD.exe in the same command prompt, leaving it in a really messy state (I see the output of the nested CMD.exe, keyboard is dead for a while, script is not executed).

`START/B CMD env-script.bat` yields the same result. None of the flags in CMD seem to match my bill.

How do I run a bat file in the background from another bat file?

I&#39;m trying to make a &quot;bubble&quot; that can popup when the `onmouseover` event is fired and will stay open as long as the mouse is over the item that threw the `onmouseover` event OR if the mouse is moved into the bubble. My bubble will need to have all manners of HTML and styling including hyperlinks, images, etc.

I&#39;ve basically accomplished this by writing about 200 lines of ugly JavaScript but I would really like to find a jQuery plugin or some other way to clean this up a bit. 

jQuery Popup Bubble/Tooltip

I need to verify if an object exists and return the object, then based on that perform actions. What&#39;s the right way to do it without returning a 404?

    try:
        listing = RealEstateListing.objects.get(slug_url = slug)
    except:
        listing = None
          
    if listing:

What is the right way to validate if an object exists in a django view without returning 404?

I need to verify if an object exists and return the object, then based on that perform actions. What's the right way to do it without returning a 404?
<pre><code class="hljs language-ini">try:
 listing = RealEstateListing.objects.get(slug_url = slug)
except:
 listing = None
 
if listing:
</code></pre>

I have been struggling with choosing a methodology for creating a RESTful API with Django. None of the approaches I&#39;ve tried seem to be the &quot;silver&quot; bullet. WAPI from http://fi.am is probably the closest to what I would like to accomplish, however I am not sure if it is acceptable in a true RESTful API to have parameters that are resource identifiers be in the querystring instead of in a &quot;clean&quot; URL format. Any suggestions for modifying WAPIs RestBinding.PATTERN to &quot;clean&quot; up the URLs? Another option I&#39;ve explored is Django-Rest-Interface. However this framework seems to violate one of the most important pieces I need, and that is to include the full resource URL for references to other resources (see http://jacobian.org/writing/rest-worst-practices/ Improper Use of Links). The final option is to use django-multiresponse and basically do it the long way.

Please offer me your best advice, especially people that have dealt with this decision.  

Django and Restful APIs

Here is the field declaration in a form: 

    max_number = forms.ChoiceField(widget = forms.Select(), 
        choices = ([(&#39;1&#39;,&#39;1&#39;), (&#39;2&#39;,&#39;2&#39;),(&#39;3&#39;,&#39;3&#39;), ]), initial=&#39;3&#39;, required = True,)
    
I would like to set the initial value to be `3` and this doesn&#39;t seem to work. I have played about with the param, quotes/no quotes, etc... but no change.

Could anyone give me a definitive answer if it is possible? And/or the necessary tweak in my code snippet?

*I am using Django 1.0*

Setting the selected value on a Django forms.ChoiceField

In Django model QuerySets, I see that there is a `__gt` and `__lt` for comparative values, but is there a `__ne` or `!=` (**not equals**)? I want to filter out using a not equals. For example, for

    Model:
        bool a;
        int x;

I want to do

    results = Model.objects.exclude(a=True, x!=5)

The `!=` is not correct syntax. I also tried `__ne`.

I ended up using:

    results = Model.objects.exclude(a=True, x__lt=5).exclude(a=True, x__gt=5)

How do I do a not equal in Django queryset filtering?

Before Django 1.0 there was an easy way to get the admin url of an object, and I had written a small filter that I&#39;d use like this: `&lt;a href=&quot;{{ object|admin_url }}&quot; .... &gt; ... &lt;/a&gt;`

Basically I was using the url reverse function with the view name being `&#39;django.contrib.admin.views.main.change_stage&#39;`

    reverse( &#39;django.contrib.admin.views.main.change_stage&#39;, args=[app_label, model_name, object_id] )

to get the url.

As you might have guessed, I&#39;m trying to update to the latest version of Django, and this is one of the obstacles I came across, that method for getting the admin url doesn&#39;t work anymore.

How can I do this in django 1.0? (or 1.1 for that matter, as I&#39;m trying to update to the latest version in the svn).



Getting Django admin url for an object

I&#39;ve pretty much tried every Python web framework that exists, and it took me a long time to realize there wasn&#39;t a silver bullet framework, each had its own advantages and disadvantages. I started out with [Snakelets][1] and heartily enjoyed being able to control almost everything at a lower level without much fuss, but then I discovered [TurboGears][2] and I have been using it (1.x) ever since. Tools like Catwalk and the web console are invaluable to me.

But with TurboGears 2 coming out which brings WSGI support, and after reading up on the religious debates between the Django and WSGI camps, I&#39;m really torn between ***&quot;doing it the right way&quot;***, e.g., learning WSGI, spending valuable time writing functionality that already exists in Django and other full-stack frameworks, as opposed to using Django or some high-level framework that does everything for me. The downsides with the latter that I can see are pretty obvious: 

 1. I&#39;m not learning anything in the process
 2. If I ever need to do anything lower level it&#39;s going to be a pain
 3. The overhead required for just a basic site which uses authentication is insane. (IMO)

So, I guess my question is, which is the better choice, or is it just a matter of opinion, and should I suck it up and use Django if it achieves what I want with minimal fuss (I want authentication and a CRUD interface to my database)? I tried Werkzeug, Glashammer, and friends, but AuthKit and Repoze scared me off, as well as the number of steps involved to just setup basic authentication. I looked at Pylons, but the documentation seems lacking, and when referencing simple features like authentication or a CRUD interface, various wiki pages and documentation seemed to contradict each other, with different hacks for versions and such. 

---
Thanks to S. Lott for pointing out that I wasn&#39;t clear enough. My question is: which of the following is worthwhile in the long run, but not painful in the short (e.g., some sort of middle ground, anyone?) - Learn WSGI, or stick with a &quot;batteries-included&quot; framework? If the latter, I would appreciate a suggestion as to whether I should give Django another try, stick with TurboGears 1.x, or venture into some other framework. 

Also, I have tried CherryPy, but couldn&#39;t seem to find a good enough CRUD application that I could plop in and use right away.

  [1]: http://snakelets.sf.net &quot;Snakelets&quot;
  [2]: http://turbogears.org &quot;TurboGears&quot;

Django vs other Python web frameworks?

Apologies, I am completely new to Django and Python.

I have 2 questions. First, how would I go about getting the last object created (or highest pk) in a list of objects? For example, I know that I could use the following to get the first object:

    list = List.objects.all()[0]

Is there a way to get the length of List.objects? I&#39;ve tried List.objects.length but to no avail.

Second, is it possible to create simultaneous filters or combine lists? Here is an example:

    def findNumber(request, number)
        phone_list = Numbers.objects.filter(cell=number)

I want something like the above, but more like:

    def findNumber(request, number)
        phone_list = Numbers.objects.filter(cell=number or home_phone=number)

What is the correct syntax, if any?

Django - Getting last object created, simultaneous filters

How can I see the current urlpatterns that &quot;reverse&quot; is looking in? 

I&#39;m calling reverse in a view with an argument that I think should work, but doesn&#39;t. Any way I can check what&#39;s there and why my pattern isn&#39;t?

Django : How can I see a list of urlpatterns?

In django how to check whether any entry exists for a query 

    sc=scorm.objects.filter(Header__id=qp.id)

This was how it was done in php

    if(mysql_num_rows($resultn)) {
        // True condition
        }
    else {
        // False condition
        }

Django check for any exists for a query

I need to serve images securely to validated users only (i.e. they can&#39;t be served as static files).  I currently have the following Python view in my Django project, but it seems inefficient.  Any ideas for a better way?

    def secureImage(request,imagePath):
        response = HttpResponse(mimetype=&quot;image/png&quot;)
        img = Image.open(imagePath)
        img.save(response,&#39;png&#39;)
        return response

(Image is imported from PIL.)

Best way to write an image to a Django HttpResponse()

I have a view function:

    @login_required
    def myview():
        # do something
        # respond something
        pass

How can I specify the exact URL for this view function to be redirected? 


Content Type	Original Author	Original Content on Stackoverflow
Question	Rasiel	View Question on Stackoverflow
Solution 1 - Django	zzart	View Answer on Stackoverflow
Solution 2 - Django	ironfroggy	View Answer on Stackoverflow
Solution 3 - Django	Henrik Heino	View Answer on Stackoverflow
Solution 4 - Django	Greg Holst	View Answer on Stackoverflow

What is the right way to validate if an object exists in a django view without returning 404?

Django Problem Overview

Django Solutions

Solution 1 - Django

Solution 2 - Django

Solution 3 - Django

Solution 4 - Django

jQuery Popup Bubble/Tooltip

How do I run a bat file in the background from another bat file?

Attributions