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Once you have installed, configured, and started the RDBMS you want to use, you need to install the appropriate DB-API 2.0 driver. In the case of SQLite, this is very easy because the software is automatically included with Python 2.5 or newer. If you are using Python 2.4 or older, you will need to install the driver in the same way you would for any RDBMS. The driver you will need for your RDBMS is listed in Table 7-1 along with the URL where you can obtain it. Most Pylons-related software is available on the Python Package Index and can be installed with the easy_install command, but if you are not running on Windows, it is usually necessary to have a build environment set up with the Python development package and appropriate client library for the RDBMS you want to use already installed so that easy_install can compile the C or C++ libraries it needs to compile. For example, with MySQL, you might run this: $ easy_install mysql-python This would download the source for the MySQLdb module (this is a rare example when the package name is significantly different from the module name) and compile it. To compile it successfully, you will need the client library. For example, on Debian Etch, you would need to install the libmysqlclient15-dev package and the python-dev package.

Note When applying transformations, it is important to keep the order in mind. Applying the transformations in a different order will yield a different result.

Until this point, when we have talked about keys, we have typically meant encryption keys. Yet, we have shown that encryption can be used to accomplish additional security goals, such as authentication; and that multiple keys (such as public and private keys) can be used to accomplish different goals even within the context of a single communication between Alice and Bob. In the next couple subsections, we will distinguish between identity keys, session keys, and integrity keys.

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Most commonly used software that isn t on the Python Package Index will be available through your platform s software repository. For example, versions of MySQLdb are available for Windows that you can install with its installer, and MySQLdb is available through the repositories for Debian, Ubuntu, Fedora, and other platforms. Mac OS X users can typically download a binary for the version of their operating system too. If you are compiling a driver from source, it is always a good idea to read the software s README or INSTALL files and to follow the instructions carefully. Bear in mind that you might need to use an older compiler than the one that comes with your platform. Although installing a Python database driver sounds like it might be difficult, in practice it is normally easy because you can usually find a binary version. If you are following along using SQLite and are using Python 2.4 or older, let s install pysqlite2: $ easy_install pysqlite This installs the pysqlite2 module to use in your application, but note that the package name is pysqlite even though you need to import pysqlite2 to use the module.

Listing 7-21. Transforming the five items int main( int argc, char **argv ) { QApplication app( argc, argv ); QGraphicsScene scene( QRect( 0, 00, 1000, 200 ) ); QGraphicsItem *item1 = createItem( 0, &scene ); QGraphicsItem *item2 = createItem( 200, &scene ); item2->translate( 300, 100 ); item2->rotate( 30 ); item2->translate( -300, -100 ); QGraphicsItem *item3 = createItem( 400, &scene ); item3->translate( 500, 100 ); item3->scale( 0.5, 0.7 ); item3->translate( -500, -100 ); QGraphicsItem *item4 = createItem( 600, &scene ); item4->translate( 700, 100 ); item4->shear( 0.1, 0.3 ); item4->translate( -700, -100 ); QGraphicsItem *item5 = createItem( 800, &scene ); item5->translate( 900, 100 ); item5->scale( 0.5, 0.7 ); item5->rotate( 30 ); item5->shear( 0.1, 0.3 ); item5->translate( -900, -100 );

Installing SQLAlchemy is easy. You simply specify the version you require with Easy Install, and it will be downloaded and installed for you. At the time of this writing, the latest version is 0.5, so the examples in this book are likely to work with any version above 0.5 and below 0.6. It is always wise to read the release notes for each new version, though: $ easy_install "SQLAlchemy>=0.5,<=0.5.99" If you want to ensure that your application uses only the version of SQLAlchemy you tested your application on, you should specify the version explicitly: $ easy_install "SQLAlchemy==0.5.0"

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