.NET/Java PDF, Tiff, Barcode SDK Library

Note When dealing with serialized objects, you must still have the classes used by those objects defined

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This chapter covers quite a bit of material. Let s take a look at what you ve learned before moving on. Algorithms. An algorithm is a recipe telling you exactly how to perform a task. When you program a computer, you are essentially describing an algorithm in a language the computer can understand, such as Python. Such a machine-friendly description is called a program, and it mainly consists of expressions and statements. Expressions. An expression is a part of a computer program that represents a value. For example, 2+2 is an expression, representing the value 4. Simple expressions are built from literal values (such as 2 or "Hello") by using operators (such as + or %) and functions (such as pow). More complicated expressions can be created by combining simpler expressions (e.g., (2+2)*(3-1)). Expressions may also contain variables. Variables. A variable is a name that represents a value. New values may be assigned to variables through assignments such as x = 2. An assignment is a kind of statement. Statements. A statement is an instruction that tells the computer to do something. That may involve changing variables (through assignments), printing things to the screen (such as print "Hello, world!"), importing modules, or a host of other stuff. Functions. Functions in Python work just like functions in mathematics: They may take some arguments, and they return a result. (They may actually do lots of interesting stuff before returning, as you will find out when you learn to write your own functions in 6.) Modules. Modules are extensions that can be imported into Python to extend its capabilities. For example, several useful mathematical functions are available in the math module. Programs. You have looked at the practicalities of writing, saving, and running Python programs.

As plain text, you can safely transmit YAML via e-mail, store it in normal text files, and move it around more easily than the binary data created by libraries such as PStore. To learn more about YAML formatting, read its Wikipedia entry at http://en. wikipedia.org/wiki/YAML, or refer to the official YAML Web site at http://www.yaml.org/.

Following your story template motif and storyboard sketches as usual, search for the term dartboard in iStockphoto to nd a result similar to the one shown in Figure 9-32.

In the previous section you created some extremely simplistic databases using text files and object persistence. Text files, of course, have their limitations. They re not reliable if many processes are using them at the same time. and they re slow. Loading a CSV file into

memory is fine when the dataset is small, but when it grows, the process of working directly with files can soon become sluggish. When developing more-robust systems, you pass database filing and management off to a separate application or system, and applications simply connect to a database system to pass data back and forth. In the previous section you were working with database files and the data within them quite directly, and that s unacceptable when performance and reliability are necessary.