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for key_constant, pressed in enumerate(pressed_keys): if pressed: key_name = pygamekeyname(key_constant) text_surface = fontrender(key_name+" pressed", True, (0,0,0)) screenblit(text_surface, (8, y)) y+= font_height pygamedisplayupdate() After Listing 6-1 gets the pressed keys as a list of booleans, it enters a for loop that iterates through each value You ll notice that the loop iterates over the pressed keys indirectly by calling enumerate, which is a built-in function that returns a tuple of the index (the first value is 0, second is 1, and so on) and the value from the iterated list If the iterated value (pressed) is True, then that key has been pressed, and we enter a small code block to display it on screen This code block uses another function in the keyboard module, pygamekeyname, which takes a key constant and returns a string with a description of the key (ie.

If you re interested in the match, you return a token that has been defined in the parser file These are the identifiers in block capitals like RPAREN or MULTI If you re not interested, you call token with the special lexbuf value function to start the parsing again The lexbuf value is automatically placed in your parser definition and represents the text stream being processed It is of type MicrosoftFSharpTextLexingLexBuffer Also notice how in places where you re actually interested in the value found rather than just the fact a value was found that you use a function called curLexeme to get the string representing the match from the lexbuf..

, it turns K_SPACE into "space") When I first ran Listing 6-1, it displayed numlock pressed even though I wasn t touching it at the time This is because numlock is a special key that switches a state in the keyboard When it s on, the numpad can be used to enter numbers But when it is off, the numpad is used for other keys that do scrolling and navigating text Another key that works like this is the Caps Lock key If you tap Caps Lock, Listing 6-1 will display caps lock pressed even when it has been released Tap it again to disable the Caps Lock state Another key that does this is Scroll Lock (on a PC keyboard), which doesn t get used much these days These three keys shouldn t be used as triggers because Pygame can t change this behavior.

As mentioned in 13, during the first iteration, an issue was brought up in one of the daily stand-ups with regard to the connection string to the database. Different developers used different connection strings based on their local machine s configuration of Open Database Connectivity (ODBC). This needed to be refactored. One of the developers accepted ownership of this issue and promised to provide a solution to be implemented in the second iteration. The solution that the developer came up with was to refactor the connection string to a DataUtilities.cs class, as shown in Listing 15-1. Now, when the connection string needs to be changed, that must be done in only one location. The entire team acknowledged that eventually, the connection string will need to be placed in some type of configuration file, so that nothing will have to be recompiled when the connection string needs to be changed. Listing 15-1. DataUtilities.cs File #region Using directives using System; using System.Collections.Generic; using System.Text; #endregion namespace DataLayer { public class DataUtilities { private static string connectionString = "Driver={Microsoft Access Driver (*.mdb)};DBQ=C:\\xpnet\\database\\Northwind";

{ module Strangelights.ExpressionParser.Lexer open open open open System System.Text Strangelights.ExpressionParser.Parser Microsoft.FSharp.Text.Lexing