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Extensions open System open SystemLinq // Import a small number of functions from ParallelLinq module PSeq = // helper function to convert an ordinary seq (IEnumerable) into a IParallelEnumerable let asParallel list: IParallelEnumerable<_> = ParallelQueryAsParallel(list) // the parallel map function we going to test let map f list = ParallelEnumerableSelect(asParallel list, new Func<_, _>(f)) // other parallel functions you may consider using let reduce f list = ParallelEnumerableAggregate(asParallel list, new Func<_, _, _>(f)) let fold f acc list = ParallelEnumerableAggregate(asParallel list, acc, new Func<_, _, _>(f)) You can use the finished version of this code to replace calls to functions from the Seq module with their equivalent calls from the PSeq wrapper module and expect your program to go faster in most cases you will find some circumstances where it might be slower.

For example, this code might execute more slowly for short lists where a relatively small amount of work is required for each item You can see this at work in a micro benchmark for a parallel map function by comparing your parallel map function to normal map function To do this, you vary both the size of the input list and the amount of work performed for each item in the input list..

The keyboard and joystick have similar up and down events; KEYDOWN is issued when a key is pressed, and KEYUP is issued when the key is released. Listing 3-3 demonstrates how you might respond to KEYUP and KEYDOWN events to move something on screen with the cursor keys. If you run this listing, you will see a window containing a simple background image. Press up, down, left, or right and the background will slide in that direction. Take your finger off the cursor key and the background will stop moving. Listing 3-3. Using Keyboard Events to Move a Background background_image_filename = 'sushiplate.jpg' import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) background = pygame.image.load(background_image_filename).convert() x, y = 0, 0 move_x, move_y = 0, 0 while True: for event in pygame.event.get(): if event.type == QUIT: exit() if event.type == KEYDOWN: if event.key == K_LEFT: move_x = -1 elif event.key == K_RIGHT: move_x = +1 elif event.key == K_UP: move_y = -1 elif event.key == K_DOWN: move_y = +1

One of the biggest advantages of XP is that it stresses high quality through up-front testing This happens with both test-driven development and acceptance testing What really makes this practice worthwhile is that it doesn t wait until the end of development to create or even run the tests Test-Driven Development and Unit Tests Test-driven development (TDD) promotes the writing of tests prior to writing the code that is being tested This allows you to focus on your interface and what you expect from your code prior to focusing on its particular implementation The testing components for implementing a test-driven development plan are known as unit tests Unit tests are small pieces of code that are written to exercise autonomous units of your implemented classes When developing these tests, you usually focus on the public interfaces of your classes A common test-driven development sequence looks something like the following: 1.

Note Micro benchmarking is a useful tool for helping you to understand the performance consequences of a small section of code. Vance Morrison has a nice MSDN article on how to run micro benchmarks on the .NET platform at http://msdn.microsoft.com/en-us/magazine/cc500596.aspx.

elif eventtype == KEYUP: if eventkey == K_LEFT: move_x = 0 elif eventkey == K_RIGHT: move_x = 0 elif eventkey == K_UP: move_y = 0 elif eventkey == K_DOWN: move_y = 0 x+= move_x y+= move_y screenfill((0, 0, 0)) screenblit(background, (x, y)) pygamedisplayupdate() Listing 3-3 begins just like Hello World; it imports and initializes Pygame, then loads a background image The event loop in this script is different, because it handles KEYDOWN and KEYUP These key events both contain the same three values: key This is a number representing the key that was pressed or released Each physical key on the keyboard has a constant that begins with K_ The alphabet keys are K_a through K_z, but there are also constants for all the other keys, such as K_SPACE and K_RETURN.