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This chapter starts by taking an ordinary C++ class and integrating it with Qt to make it more reusable and easier to use. In the process, you have a look at the build system used to compile and link Qt applications as well as installing and setting up Qt on your platform. The chapter then discusses how Qt can enable you to build components that can be interconnected in very flexible ways. This is what makes Qt such a powerful tool it makes it easy to build components that can be reused, exchanged, and interconnected. Finally, you learn about the collection and helper classes offered by Qt.

1. Download the virtualenv.py script from http://pylonsbook.com/virtualenv.py. 2. Create a virtual Python environment in a directory called env so that packages you install for Pylons do not affect any other programs using Python on your system: python virtualenv.py --no-site-packages env 3. Windows users would use Scripts instead of bin in the above command but full details are explained later in the Windows-specific instructions. Use the easy_install program (which was automatically installed into your virtual Python environment by the previous command) to install Pylons: env/bin/easy_install "Pylons==0.9.7" Once the installation has finished, you should always use the programs in env/bin rather than the scripts in your system Python installation. For example, where examples in the book specify something like this: $ paster serve --reload development.ini you would actually need to type the following to have the command run from your virtual Python environment: $ env/bin/paster serve --reload development.ini If you don t quite understand the implications of the setup described here, please read the rest of the chapter for the full details.

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Before you can start developing Qt applications, you need to download and set up Qt. You will use the open source edition of Qt because it is freely available for all. If you have a commercial license for Qt, you have received installations instructions with it. The installation procedure differs slightly depending on the platform that you are planning to use for development. Because Mac OS X and Linux are both based on Unix, the installation process is identical for the two (and all Unix platforms). Windows, on the other hand, is different and is covered separately. You can start all three platforms by downloading the edition suitable for your platform from www.trolltech.com/products/qt/downloads.

Physically securing your system and laying down good policies for employees and users is often just as important as using the technological security mechanisms that we cover in this book. All of your servers should be behind locked doors, and only a privileged set of employees (typically system and security administrators) should have access to them. In addition, data centers used to house farms of servers can employ cameras, card reader and biometric locks, and even vaults of various kinds, depending upon the sensitivity of data stored on the servers. In addition to mechanisms that limit access to a physical space to prevent asset theft and unauthorized entry, there are also mechanisms that protect against information leakage and document theft. Documents containing sensitive information can be shredded before they re disposed of so that determined hackers can be prevented from gathering sensitive information by sifting through the company s garbage. Such an attack is often referred to as dumpster diving.

Now that you ve seen the commands used to install Pylons, let s take a detailed look at the installation process and what the commands actually do. In the following sections, you ll learn about how packages are stored in a format known as an egg, how Easy Install searches online to find the packages you require, and how to install and work with a virtual Python environment.

You can download all Python packages from a special part of the Python web site known as the Python Package Index (PyPI) at http://pypi.python.org. As well as providing the packages, the Python Package Index also contains information about each package such as the author, the project s home page, and a description of the project. Python packages can contain Python source code, configuration files, data files, C or C++ extensions, and metadata about the package. In Part 3 of the book, you ll learn how you can package up your Pylons applications and automatically upload them to PyPI, but for the moment you need to know only that PyPI is the main place where you can find Python software.

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