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Figure 7-1. The x value increases from left to right; the y value increases from the top downward. Figure 7-2 shows how the coordinate system of a widget can be different from the screen when drawing on a widget. The coordinates used when drawing on a widget are aligned so that (0,0) is the upper-left corner of the widget (which is not always the same as (0,0) in the device s global coordinate system). The global coordinate system addresses actual pixels onscreen, dots on printers, and points on other devices.

In this subsection, we review some relevant points originally made in 2 regarding security by obscurity. Note that the design of the DES and Triple DES algorithms are completely public. They are specified in FIPS 46-3. Their security, however, is not dependent upon the secrecy of the algorithm it is dependent upon the keys provided as input to the algorithm. If an attacker determines a key, you can simply change it to thwart further eavesdropping or attack. Unless there is some mathematical property of the algorithms that the attacker can exploit, her only option is brute-force search for the correct key. Moreover, every additional bit used in the key doubles the number of keys that the attacker needs to try to find the correct one. Therefore, if you use a long enough key, it would take the attacker too much time to attack the algorithm via brute-force search. The attacker s best option may be to attack the algorithm based on its mathematical properties. The hope, however, is that it is very hard to defeat the mathematical properties of the algorithm. Cryptographers have put much effort into the design of encryption algorithms such as Triple DES and AES. You probably should not try to invent your own encryption algorithm with the hopes of doing better. At the same time, we do not discourage innovation. If you have an idea about how to do encryption better, have read cryptography literature, and have designed your own encryption algorithm, you should share that algorithm with other cryptographers and give them the opportunity to crack it before considering using it in a real system that users depend on. Make your algorithm public, just as other cryptographers have, to ensure that the security of the algorithm you are developing is not based on its obscurity.

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Again, the helpers won t flag this as an error; it is up to you to decide what is right for your application and be responsible for the attributes you set >>> htext('test', 'Welcome', myattribute='myvalue') '<input type="text" value="Welcome" myattribute="myvalue" />' One common use for this functionality is to specify the CSS class the field should have The problem is that class is a reserved word in Python, so to specify the class attribute, you need to pass in the parameter class_ with a trailing _ character >>> htext('test', 'Welcome', class_='wide') '<input type="text" value="Welcome" class="wide" />' The text() helper has a special behavior for the attributes disabled, size, and maxlength All the single value field helpers behave in a similar way They are checkbox(), file(), hidden(), image(), password(), radio(), submit(), and textarea() There is also a select() helper, and it behaves slightly differently.

Figure 7-2. When drawing on a widget, the upper-left corner of the widget is (0,0).

If you look at the documentation for select(), you ll see it is defined like this: select(name, selected_values, options, **attrs).

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