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The Study schema expects nested data structures, but HTML forms produce flat structures with keys (field names) and their associated values. To solve this problem, FormEncode provides a NestedVariables class in the nestedvariables module that provides a way of converting nested data structures to and from a flat set of field names. To do this, it uses keys with "." for nested dictionaries and "-int" for (ordered) lists. A structure like this:

All Qt widgets are paint devices, so you can create a QPainter object and use it to draw to a widget. However, this can be done only from the paintEvent(QPaintEvent*) method.

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his chapter continues our discussion of cryptography by examining asymmetric key cryptography. In the previous chapter, we covered symmetric key cryptography. The problem with symmetric key cryptography is that any two parties that want to exchange confidential information with each other need to agree on a key beforehand. Alice needs to somehow tell Bob the key in order for him to decrypt a message that she sends him. Alice and Bob could meet in person to agree on a key but this is not usually possible in an Internet transaction. How should they agree upon a key For thousands of years, symmetric key cryptography was the only kind of cryptography that existed. In the 1970s, two scientists by the name of Diffie and Hellman came up with a new encryption method called asymmetric key cryptography, also sometimes referred to as public key encryption. Asymmetric key cryptography can help Alice and Bob communicate without having to meet a priori to agree upon a key.

{ 'people': [ {'fname': "John", 'lname': "Doe"}, {'fname': "Jane", 'lname': 'Brown'}, "Tim Smith" ], 'action': { None: "save", 'option': "overwrite", 'confirm': "yes" }, } can therefore be mapped to form fields with the names and values in Table 6-3. Table 6-3. Field Names Used in the Example and Their Corresponding Values

The paintEvent method is called by the event loop when a widget needs to be redrawn. You need to tell Qt when you want to redraw your widgets, and Qt will call your paintEvent method. You can achieve this with two methods: update and repaint. The repaint method triggers and immediately redraws, while update places a request for an update on the event queue. The latter means that Qt gets a chance to merge update calls into fewer (optimally as single) calls to paintEvent. This can be both good and bad. It is bad because you could have created a widget that relies on paintEvent being called a specific number of times. It is good because it allows Qt to tune the number or repaints to the current workload of the system running your application. In almost all cases, you should use update. When doing so, try to avoid relying on the paintEvent method being called a certain number of times.

people-0.fname people-0.lname people-1.fname people-1.lname people-2 action action.option action.confirm

Why do we need asymmetric key cryptography For example, if two people who do not know each other want to communicate privately on the Internet, it would be extremely inconvenient for them to have to meet in person or talk over the phone to agree upon a key Asymmetric key cryptography provides a way for them to do so without having to go to these lengths To illustrate how, we provide an example of a personal dating application in which users do not know each other beforehand, and would like to have private conversations with each other Let us consider a personal dating application with three users: Alice, Bob, and Carol Bob posts a personal ad Bob wants Alice and Carol to be able to send him personal messages, but he wants the contents of those messages to be confidential Bob is a two-timer.

Note There are more reasons for not relying on paintEvent being called as often as you call update. For instance, your widget can be completely obstructed, or something might be moving in front of it causing fewer or more calls to paintEvent.

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