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Internationalization and localization are about much more than just translating an application. You can no longer depend on many things that you take for granted: date format, time format, number format, icons being understood by the user, legal characters, and so on. The process is really about understanding the target culture and its conventions. This is what makes deploying an application worldwide such a big task. By using lupdate, lrelease, and Linguist together with the QLocale class, you have come a long way. Try to keep your text in QString and QChar as much as possible to ensure that Unicode is used (saving you from having to think about encoding characters all the time). Before deploying, be sure to test in all locales that you intend to target. Try to use local testers if possible they will probably spot more mistakes than you will.

Object-relational mappers (ORMs) are tools that map the data structures in your database, namely, the rows in each table to objects in your Pylons application. As you manipulate the objects in the application, they automatically generate the SQL necessary to manipulate the underlying data. Using an object-relational mapper has a number of advantages: They make it much easier and more convenient to work with the underlying data. Your Pylons application will work on any of the database engines supported by the objectrelational mapper you use. They usually deal with some of the complications such as connection pools and thread safety for you. They re often easier to learn for newcomers than learning SQL. Although object-relational mappers have major advantages, they are not without their weaknesses:

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In our discussion of symmetric and asymmetric algorithms thus far, when we have discussed keys, we have meant encryption keys. The most obvious application of encryption is to achieve confidentiality. Encryption, however, can be used to accomplish other security goals as well. Encryption can, for example, be used to achieve authentication. To demonstrate this, we start with an example toy protocol that allows us to do authentication with a public key cryptosystem.

offers a rich programming interface that is capable of interacting with many different technologies. This capability is what makes it possible for Qt-driven applications to look different on different platforms; images can be stored in many different ways and interact with numerous database solutions. You might be surprised to know that you can create your own new Qt features using a Qt feature known as a plugin. The classes used by Qt to handle plugins are not limited to extending Qt. With the same set of classes you can also create your own plugin interfaces and extend your own applications with custom plugins. This makes it possible to create extendable applications without having to deal with all the platform specifics involved in the process.

By abstracting away the SQL, you generally have less control over the database than you would have had Tools such as SQLAlchemy make up for this by also providing you with raw SQL access for the occasions when it is needed If you don t understand how object-relational mappers work, it is easy to write inefficient code that requires many SQL statements to be executed (Careful reading of this chapter should prevent that problem, though) Object-relational mappers can sometimes contain quite complex code that is necessary to make the interfaces they expose so easy to use This means that if you run into a problem, it can be hard to track it down in the source code By choosing a popular ORM such as SQLAlchemy, the chances are that there are a very few bugs, and any you find are likely to be dealt with quickly by the community.

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