Inject dependencies on python 3 functions, methods and classes using type hint:

@aldo
def my_func(foo: Foo):
    return foo

Calling my_func without parameters will be handled using aldo dependency manager.

You can also "teach" aldo how to create an instance of a class (or subclass):

@teach(Cache)
def cache_factory(*args, **kwargs):
    return RedisCache()
    
@aldo
def my_view(cache: Cache):
    return cache
>>> my_view()
<RedisCache>

Aldo was teached for some tricks in django, so you can use a view like this:

url(r'^(?P<question_id>[0-9]+)/$', views.show),

@aldo
def show(request, poll: models.Poll):
    return HttpResponse(poll.question_text)

Aldo knows that when you have a Model, he can use "MODELNAME_FIELD" kwarg (the name of the field used in uri regular expression) to query database for an instance of it.

Aldo also knows how to use forms.Form and forms.ModelForm:

url(r'^store/$', views.store),

@aldo
def store(request, form: forms.QuestionForm):
    return HttpResponse(form.data)

Here we have two cases:

• GET request: initial data is filled with request.GET, aka. forms.QuestionForm(initial=request.GET)
• POST request: form is filled with request.POST, aka. forms.QuestionForm(request.POST). In this case aldo also verify if form is valid, otherwise it redirects the request back to HTTP_REFERER, sending request.POST data back. You can use it like this:

url(r'^create/$', views.create),
url(r'^store/$', views.store, {'method': 'POST'}), # user can not access it without a POST

@aldo
def create(request, form: forms.QuestionForm):
    return render(request, 'polls/create.html', locals())

@aldo
def store(request, form: forms.QuestionForm):
    form.save()
    return redirect('/polls')