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Once you have set up all the database metadata, SQLAlchemy has all the information it needs for you to be able to use its SQL Expression API. The SQL Expression API enables you to build SQL queries programmatically using Python objects and operators. This can take a lot of the pain out of SQL because you don t have to worry about converting Python values to safe SQL strings. Let s create a new file called sqlexpression_test.py and add the following to it: from metadata_test import engine, page_table You can now use the page table to perform simple operations. Here s how you might perform a simple insert operation. Add the following to sqlexpression_test.py too: print "\nSQL Expression Example\n" connection = engine.connect() ins = page_table.insert( values=dict(name=u'test', title=u'Test Page', content=u'Some content!') ) print ins result = connection.execute(ins) print result connection.close() If you run this example, the output from metadata_test.py will be displayed first because you imported that file; then it will be followed by the output from sqlexpression_test.py, which looks like this: SQL Expression Example INSERT INTO page (name, title, content) VALUES ( , , ) <sqlalchemy.engine.base.ResultProxy object at 0x58c3f0> The ins object automatically generates the correct SQL to insert the values specified, and an instance of a ResultProxy object (which you saw in the Engine API description) is returned to allow you to iterate over the results. Since this is an insert statement, there won t be any interesting values returned.

But how should Alice generate s If an attacker can guess s, it does not really matter that Alice had gone through the trouble of encrypting that random number before sending it to Bob. An eavesdropper who can just guess s can decrypt any data that Alice and Bob exchange that is encrypted with s. If the eavesdropper is not simply a passive one, he would also then be able to modify or inject data into Alice and Bob s conversation. Now that we have demonstrated a concrete example in which an inability to generate unpredictably random numbers can result in insecurity, we discuss how we might go about trying to generate random numbers.

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Pylons works with all versions of Python since 2.3, but it is recommended that you use Python 2.4 or newer because some of the third-party packages you are likely to use when developing a Pylons application are less likely to support the older versions. Python 2.5 or 2.6 are ideal. The following sections describe how to install Python on Linux/BSD, Windows, and Mac OS X platforms. They also go into some detail about other tools and software you are likely to need on your platform as well as any extra steps you need to take or platform-specific issues you need to know.

break; ... } return QGraphicsItem::itemChange( change, pos()+movement ); The top and right handles affect only themselves, which means that they do not use the m_handles list. The center point of the shape is not affected; the horizontal direction is not affected by the top handler nor is the vertical direction affected by the right handle. Listings 7-30 and 7-31 show how the roles are handled. The listings look very similar; the only difference is the direction in which they act. Let s look at the details of Listing 7-30; that is, the top handle. The listing starts with an if clause that ensures that the shape will not be too small. If that s the case, pass the current position as the next position to the QGraphicsItem itemChange method. If the handled shape is big enough, continue by limiting the movement to the direction of the handle (you don t allow horizontal movement for the top handle). Then you translate the shape being handled so the center of the shape is the origo of the coordinate system. This is a preparation for the scaling, in which you scale the shape according to the movement. The shape is translated back into its original location, the switch statement is left, and the QGraphicsItem itemChange method is given the event, but with the direction of limited movement. Listing 7-30. Handling movements of a top handle switch( m_role ) { ... case TopHandle: if( -2*movement.y() + m_item->sceneBoundingRect().height() <= 5 ) return QGraphicsItem::itemChange( change, pos() ); movement.setX( 0 ); m_item->translate( center.x(), center.y() ); m_item->scale( 1, 1.0-2.0*movement.y() /(m_item->sceneBoundingRect().height()) ); m_item->translate( -center.x(), -center.y() ); break; } return QGraphicsItem::itemChange( change, pos()+movement );

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