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All snippets written in Python

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Create variables within templates

Here is a Django template tag that allows you to create complex variables specified in JSON format within a template. It enables you to do stuff like: {% var as person %} { "firstName": "John", "lastName": "Smith", "address": { "streetAddress": "21 2nd Street", "city": "New York", "state": "NY", "postalCode": 10021 }, "phoneNumbers": [ "212 555-1234", "646 555-4567" ] } {% endvar %} <p>{{person.firstName}}, </br> {{person.address.postalCode}}, </br> {{person.phoneNumbers.1}} </p> This tag also enables me to do dynamic CSS using as follows: # urlpatters urlpatterns = patterns('', (r'^css/(?P<path>.*\.css)$', 'get_css'), ) #views def get_css(request, path): return render_to_response('css/%s' % path, {}, mimetype="text/css; charset=utf-8") # dynamic css within in /path/to/app/templates/css' {% load var %} {% var as col %} { "darkbg": "#999", "lightbg": "#666" } {% endvar %} {% var as dim %} { "thinmargin": "2em", "thickmargin": "10em" } {% endvar %} body { background: {{col.darkbg}}; margin: {{dim.thinmargin}}; }

  • tag
  • json
  • css
  • variables
  • var
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RecaptchaForm

There already is a [snippet on here](http://www.djangosnippets.org/snippets/433/) that shows how to use reCAPTCHA with Django, but being the lazya-- that I am, I wanted the form to: * display the captcha when as_table is used * handle captcha validation for me So RecaptchaForm does the trick. Just subclass from it and voila, your form will include reCAPTCHA validation. Other than that, you need to * be on Django trunk version (or use clean_data instead of cleaned_data for 0.96) * set RECAPTCHA_PRIVATE_KEY and RECAPTCHA_PUBLIC_KEY in your settings.py * make sure that the [captcha module](http://pypi.python.org/pypi/recaptcha-client) is available somewhere (i.e. that "import captcha" works)

  • captcha
  • recaptcha
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get_cache_or_query - Shortcut to common cache signature

Replaces something like this: cache_key = 'game1' the_game = cache.get(cache_key) if not the_game: the_game = Game.objects.get(id=1) cache.set(cache_key, the_game, 60*24*5) With this: the_game = get_cache_or_query('game1', Game, seconds_to_cache=60*24*5, id=1)

  • cache
  • optimization
  • get_cache_or_object
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Paginator TemplateTag

**Paginator TemplateTag** TemplateTag to use the new Paginator class directly from a template. The paginate template tags take the following options: 1. list or queryset to paginate 2. number of pages 3. [optionaly] name of the Paginator.Page instance; prefixed by keyword 'as' 4. [optionaly] name of the http parameter used for paging; prefixed by keyword 'using' If you want to specify the parameter name with the keyword 'using' you must use the 'as' keyword as well. The default name of the paging variable is "page" and the paginator (the class that knows about all the pages is set in the context as "page_set". This follows the naming scheme of the ORM mapper for relational objects where "_set" is appended behind the variable name. Usage, put the following in your template: {% load paginate %} {% get_blog_posts blog_category as posts %} {% paginate posts 10 as page using page %} <ul> {% for post in page.object_list %} <li>{{ post.title }}</li> {% endfor %} </ul> <div> {% if page.has_previous %} <a href="?page={{ page.previous_page_number }}">previous</a> {% endif %} <i>{{ page.number }} of {{ page_set.num_pages }}</i> {% if page.has_next %} <a href="?page={{ page.next_page_number }}">next</a> {% endif %} </div> The templatetag requires the request object to be present in the template context. This means that you need 'django.core.context_processors.request' added to settings.TEMPLATE_CONTEXT_PROCESSORS list or otherwise make sure that the templatetag can access the request object. Comments are appreciated.

  • templatetag
  • pagination
  • paginator
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Extensible exception handling middleware

This exception middleware abstracts the functionality of the builtin exception handling mechanisms, but makes them extensible by inheritance. Just add it (or some subclass) to the top of your active middleware list. You can use this to [make your admin emails more informative](http://www.djangosnippets.org/snippets/631/) or [log errors to a file](http://www.djangosnippets.org/snippets/639/).

  • middleware
  • exception
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CSVImport

Importing data from other sources than SQL can be an annoyance. This script serves as a general tool for importing data from CSV files.

  • csv
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cache_smart template tag

cache_smart template tag is a drop in replacement for default cache tag by Django but with the added bonus to be more resistant against dog-pile/stampeding effect. This snippet uses a extra cache entry to store a stale time so we don't have to pickle/unpickle to store this extra value. If this cache entry returns None, as in expired it will reset the stale timeout 30 seconds in the future so further calls will just return the old value while this request is regenerating the new value. **warning** Don't use both cache template tags!

  • template
  • cache
  • memcached
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Logging and statistic middleware

Reviewing some statistic-middleware-classes I think you might need one wich is working correct and high-performant. Please comment it and have fun with it!

  • middleware
  • stats
  • logging
  • statistic
  • user-activities
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FCKWidget for NewForms

This is a simple FCK editor widget that can be used in newforms in place of Textarea. Obviously it requires [FCKeditor](http://www.fckeditor.net/) and you will need to set the proper import path for that.

  • newforms
  • rich-text-editor
  • wisiwig
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TableSelectMultiple Widget

A widget for selecting from a list of `Model` instances using `MultipleChoiceField` which renders a table row for each choice, consisting of a column for a checkbox followed by a column for each item specified in `item_attrs`, which must specify attributes of the objects passed as choices.

  • forms
  • table
  • widget
  • selectmultiple
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Autoreload Apache on project modifications

This script will reload apache when any modifications are detected in a folder - useful only if the development server or mod_python's reload does not suit your needs for testing. It requires Linux 2.6.13+, Python 2.5, and the [development version of pyinotify](http://seb.dbzteam.com/pages/pyinotify-dev.html).

  • apache
  • reload
  • autoreload
  • modified
  • linux
  • pyinotify
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humanize time difference (how long ago)

If you ever have a need to display something like: "last update 5 days ago" "user logged in 2 mins ago" you can use this script to determine how long ago a timestamp is versus now().

  • time
  • now
  • humanize
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cron/console bootstrap django

Call this function as the first thing in your cron, or console script; it will bootstrap Django, and allow you to access all of the Django modules from the console, with out using 'python manage.py shell' Examples: # A script within your django project. from django_bootstrap import bootstrap bootstrap(__file__) --- or --- # A cron script located outside of your django project from django_bootstrap import bootstrap bootstrap("/path/to/your/project/root/")

  • django
  • console
  • cron
  • bootstrap
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