Login

All snippets written in Python

2957 snippets

Snippet List

ScriptPrefixMiddleware

Adds http://hostname or https://hostname before every URL generated by a Django url function. **Example:** Normally, something like YourModel().get_absolute_url() would return `/2009/09/02/slug`. However, this is not an absolute URL, because it does not include an HTTP schema or host. With this middleware, YourModel().get_absolute_url() will return `http://yourdomain.com/2009/09/02/slug`. This will also work for calls to reverse() or the {% url %} template tag. **Installation:** Drop this code into yourproject/middleware/scriptprefix.py. **Usage:** In your settings.py, add: MIDDLEWARE_CLASSES = ( # ... 'yourproject.middleware.scriptprefix.ScriptPrefixMiddleware', # ... )

  • url
  • domain
  • get_absolute_url
  • host
  • set_script_prefix
Read More

Arbitrary length formset

A formset class where you can add forms as you discover the need within your code. There is also the ability to add ManagmentForm fields. If you ever found yourself in a situation where 1) you have repeated forms that need to be displayed in different locations, or 2) if you find the application logic works better if you add forms as you discover you need them, this code will help you out. Below is pseudo code based on a real implementation I used. Each form had a save button and the SELECTED_PAYMENT field was set through JavaScript. It is very difficult to use JavaScript with repeated forms, without using a formset. from myProject.myApp import myFormsUtils from myProject.myApp.forms import PaymentForm SELECTED_PAYMENT = 'SELECTED_PAYMENT' # extra_fields format: {Field name: (Field type, Initial value)} l_extra_fields = {SELECTED_PAYMENT: (forms.IntegerField, -1)} PaymentFormSetType = myFormsUtils.formset_factory(PaymentForm, extra=0, extra_fields=l_extra_fields) if request.method == 'POST': paymentFormSet = PaymentFormSetType(data=request.POST) if paymentFormSet.is_valid(): li_curFormIdx = pagaFormSet.management_form.cleaned_data[SELECTED_PAYMENT] paymntForm = paymentFormSet.forms[li_curFormIdx] ... do stuff ... # To generate the formset paymentFormSet = PagamentoFormSetType() # You can re-add a form retrieved (as in the one above) l_form = paymentFormSet.add_form(paymntForm) # Or use the add function just like creating a new form l_form = paymentFormSet.add_form(personID=argPersonID, propID=argPropID, year=argYr, amt=lc_Amt) I then stored the `l_form` variables above directly into a unique Context structure and displayed them each individually in my template. Of course this also meant that I also had to output the `paymentFormSet.management_form` explicitly within my template. EDIT 09-11-2009: Modified the initial_form_count() method to properly handle initial form values in conjunction with dynamically added forms.

  • form
  • formset
  • factory
  • arbitrary-length
Read More

Facebook event selector field

Ripped this out of a project I'm working on. The field renders as two <select> elements representing the two-level hierarchy organized events Facebook uses. Returns the id's Facebook wants.

  • forms
  • field
  • widget
  • facebook
  • fbml
  • fbjs
Read More

Private Context Decorator

Django's standard inclusion_tag doesn't include context variables by default. When you add takes_context you are required to manually merge the context variables into the dict which your tag returns, which tends to result in wasteful code or [possibly accidentally] leaking variables into the global context (`context.update({…})`). This decorator allows your inclusion tag to remain simple and still have safe access to the global context for things like `MEDIA_URL`: @register.inclusion_tag('my_template') @private_context def my_tag(context, …): return {"foo": 1, "bar": 2}

  • templatetag
  • decorator
  • context
  • inclusion_tag
Read More

location context_processor

A simple context_processor to include location info. Useful for permalinks, site name references, and navigation bars. For example: {% if location.path|match:"/$" %} class="current"{% endif %} See also my [match filter](/snippets/1686/).

  • url
  • path
  • location
  • nav
Read More

Simple Age Verification Middleware

Simple middleware+decorator to handle age verification. Modeled after `django.contrib.sessions.middleware` to add an attribute to `request.user` called `is_age_verified` with consideration to [snippet 1002](http://www.djangosnippets.org/snippets/1002/). Decorator modeled after `django.contrib.auth.decorators.login_required` Installation: Create `verify_age` URLconf in `urls.py` Create age verification page that URLconf points to Define `settings.VERIFY_AGE_URL` based on URLconf Add `age_verification.AgeVerificationMiddleware` to `MIDDLEWARE_CLASSES` Import both `age_verification_required` and `REDIRECT_FIELD_NAME` in `views.py` Implement `age_verification.AgeVerification.verify` somewhere to set session attribute on successful verification. Use `@age_verification_required` decorator for views requiring age verification Example urls.py: urlpatterns += patterns('mahalo.answers.views', ... url(r'^verify_age/?$', 'verify_age', name="verify_age"), ... Example settings.py: ... VERIFY_URL = '/verify_age/' ... MIDDLEWARE_CLASSES += ( ... 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'myproject.contrib.middleware.age_verification.AgeVerificationMiddleware', ... Example views.py: from myproject.contrib.decorators import age_verification_required, REDIRECT_FIELD_NAME from myproject.contrib.middleware.age_verification import AgeVerification ... @age_verification_required def some_view(request): return render_to_response("index.html", {}) def verify_age(request): # project specific template_vars = default_template(request) # form was posted if request.POST.has_key("month") and request.POST.has_key("day") and \ request.POST.has_key("year"): # "verify" user av = AgeVerification(request.session) av.verify() if request.POST.has_key(REDIRECT_FIELD_NAME): return HttpResponseRedirect(request.POST[REDIRECT_FIELD_NAME]) else: return HttpResponseRedirect(reverse("root")) # no form posted, show it else: if request.GET.has_key(REDIRECT_FIELD_NAME): template_vars["next"] = request.GET[REDIRECT_FIELD_NAME] return render_to_response("verify_age.html", template_vars) These examples assume `age_verification.py` lives in `myproject/contrib/middleware/` and `decorators.py` lives in `myproject/contrib/`

  • middleware
  • session
  • age-verification
  • session-backed
Read More

S/MIME Encrypted E-mail

Requires the M2Crypto module. See [http://sandbox.rulemaker.net/ngps/m2/howto.smime.html](http://sandbox.rulemaker.net/ngps/m2/howto.smime.html) for more information on using M2Crypto to create S/MIME email. This could also be adapted to allow signing, or sign+encrypt, but currently only encrypts. Use just like `EmailMessage`, except takes an extra parameter `cert`, which is the path to the recipient's public X.509 certificate.

  • email
  • emailmessage
  • encryption
Read More

Decorator that limits request methods

I wanted to be able to limit which types of requests a view will accept. For instance, if a view only wants to deal with GET requests. @methods(GET) def index(request): # do stuff Now, calling this view with a non-GET request will cause a 403. You can easily change this to a 404, by using a different return function: which you may wish to do with openly available sites, as a 403 indicates there is a resource present.

  • decorator
  • request
Read More

StateField

Based on [CountryField](http://www.djangosnippets.org/snippets/494/).

  • model
  • field
  • state
  • statefield
Read More

Template tags to integrate with modconcat

Assumes mod_concat is installed: http://code.google.com/p/modconcat/ Django template tags that combine blocks of CSS and Javascript into modconcat friendly URLs. Takes this: `{% cssconcat "{{ MEDIA_URL }}css/" %} <link href="{{ MEDIA_URL }}css/a.css" rel="stylesheet" type="text/css" /> <link href="{{ MEDIA_URL }}css/b.css" rel="stylesheet" type="text/css" /> <link href="{{ MEDIA_URL }}css/c.css" rel="stylesheet" type="text/css" /> {% endcssconcat %}` And outputs this: `<link href="/site_media/??a.css,b.css,c.css" rel="stylesheet" type="text/css" /> ` Similarly for javascript: `{% jsconcat "{{ MEDIA_URL }}js/" %} <script src="{{ MEDIA_URL }}js/a.js" type="text/javascript"></script> <script src="{{ MEDIA_URL }}js/b.js" type="text/javascript"></script> <script src="{{ MEDIA_URL }}js/c.js" type="text/javascript"></script> {% endjsconcat %}` becomes: `<script src="/site_media/??a.js,b.js,c.js" type="text/javascript"></script> `

  • javascript
  • css
  • modconcat
  • mod_concat
Read More