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Now, let s take a look at a view you might use to display and process this form: from django.http import HttpResponseRedirect from django.shortcuts import render_to_response def signup(request): if request.method == 'POST': form = SignupForm(data=request.POST) if form.is_valid(): new_user = form.save() return HttpResponseRedirect("/accounts/login/") else: form = SignupForm() return render_to_response('signup.html', { 'form': form }) Let s break this down step by step: 1. First you check the method of the incoming HTTP request. Usually, this will be GET or POST. (Though there are other HTTP methods, they re not as commonly used, and web browsers typically only support GET and POST for form submissions.) 2. If, and only if, the request method is POST, you instantiate a SignupForm and pass it request.POST as its data. Back in 3, when you wrote a simple search function, you saw that request.GET is a dictionary of data sent with a GET request, and similarly request.POST is the dictionary of data (in this case, the form submission) sent along with a POST request. 3. You check whether the submitted data is valid by calling the form s is_valid() method. Under the hood, this matches up the submitted data with the fields on the form and checks against each field s validation rules. If the data passes validation, is_valid() will return True, and the form s cleaned_data dictionary will be populated with the correct values. Otherwise, is_valid() will return False, and the cleaned_data dictionary will not exist.

However, you can still eliminate this unnecessary cost The first option is to do some bytecode weaving, simulating the behavior of the C library loader, or play tricks with class-loaders as discussed in the section The Importance of Module Dependencies in 19 Or, for each runtime container, you can provide an infrastructure that optimizes the speed of queries by caching The effectiveness of caches can vary However, it s clear that you can easily and effectively optimize for the most desired state, which is the state when the system only has the modules that require the latest version of the alternative behavior This situation can be decided globally at load time so that there is no need to check the caller at the time of method invocation Actually, this is a nice example of finding the balance between the backward compatibility and the need to upgrade.

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By using the address given by the pointer to that variable, we can tell the current value of the stack pointer! Very clever The difference between the stack pointer and either __bss_end or __brkval (as appropriate) will, therefore, tell us how much space is left in memory between the heap and the stack For more background information about this issue and a more fully featured memory-checking routine wrapped up as a simple library, have a look at the posts in the following interesting thread on the Arduino forums: wwwarduinocc/cgi-bin/yabb2/YaBBpl num=1213583720/20.

If modules in the system are not upgraded yet, they get the environment that they expect At the same time, the whole system might suffer from performance penalties However, the lost performance is regained as soon as developers change the dependencies to the latest version and consciously accept the new behavior even without changing a line of their code, just module dependencies This is a soft hint motivating people to upgrade, while not forcing them to do so At least technically, if your project has a performance team, it s clear that upgrading will still be an urgent priority For the moment, let s leave the discussion of runtime selection of alternative behavior Next we ll look at the range of choices you have when offering alternatives during compilation The simplest approach has already been mentioned: simply copy the class and offer a new one.

The LiquidCrystal library is very handy for driving parallel LCD modules with minimal effort, and is used elsewhere in this book, such as the Water Flow Gauge project in 10. However, if you re really

4 If the data was valid, you call the form s save() method, which you previously defined Then you return an HTTP redirect using djangohttpHttpResponseRedirect to a new page, which, presumably, would be wired up to a view to let the new user log in Whenever you accept data from an HTTP POST, you should always redirect after successful processing By taking the user to a new page, you avoid a common pitfall where refreshing or clicking the Back button in a web browser accidentally resubmits a form 5 If the request method was anything other than POST, you instantiate a SignupForm without any data Technically speaking, this is called an unbound form (one that has no data to work with), as opposed to a bound form, which does have some data to validate 6.

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