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Writing programs is a mixture of art, craft, and science, and because it is done by humans, mistakes are made Fortunately, there are techniques we can use to help avoid problems in the rst place, and techniques for identifying and xing mistakes when they become apparent Mistakes fall into several categories The quickest to reveal themselves and the easiest to x are syntax errors, since these are usually due to typos More challenging are logical errors with these, the program runs, but some aspect of its behavior is not what we intended or expected Many errors of this kind can be prevented from happening by using TDD (Test Driven Development), where when we want to add a new feature, we begin by writing a test for the feature which will fail since we haven t added the feature yet and then implement the feature itself Another istake is to create a program that has needlessly poor performance This is almost always due to a poor choice of algorithm or data structure or both However, before attempting any optimization we should start by nding out exactly where the performance bottleneck lies since it might not be where we expect and then we should carefully decide what optimization we want to do, rather than working at random In this chapter s rst section we will look at Python s tracebacks to see how to spot and x syntax errors and how to deal with unhandled exceptions Then we will see how to apply the scienti c method to debugging to make nding errors as fast and painless as possible We will also look at Python s debugging support In the second section we will look at Python s support for writing unit tests, and in particular the doctest module we saw earlier (in 5 and 6), and the unittest module We will see how to use these modules to support TDD In the chapter s nal section we will brie y look at pro ling, to identify performance hot spots so that we can properly target our optimization efforts.

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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the of ca1 is 3; the dimension of ca2 nd ca3 C++ standard library from to remember the The dimension authors' approach to teaching it They now introduce the is 4 It is important the beginning, giving readers the means when initializing an array of characters every language detail Highlighting today's best null-terminator to write useful programs without first having to master to a literal For example, the following practices, they show how to write is a compile-time error: programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and is 7 elements with This Rewritten const char ch3[6] = "Daniel"; // error: Daniel More Effectively Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in explicit characters, the the book's array size is sevensix to While the literal contains only six its coverageThe source code forrequired extended examples is available on the Web at the address one hold the literal andbelow for the null.

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In this section we will begin by looking at what Python does when there is a syntax error, then t the tracebacks that Python produces when unhandled exceptions occur, and then we will see how to apply the scienti c method to debugging But before all that we will brie y discuss backups and version control When editing a program to x a bug there is always the risk that we end up with a program that has the original bug plus new bugs, that is, it is even worse than it was when we started! And if we haven t got any backups (or we have but they are several changes out of date), and we don t use version control, it could be very hard to even get back to where we just had the original bug Making regular backups is an essential part of programming no matter how reliable our machine and operating system are and how rare failures are since failures still occur But backups tend to be coarse-grained, with les hours or even days old Version control systems allow us to incrementally save changes at whatever level of granularity we want every single change, or every set of related changes, or simply every so many minutes worth of work Version control systems allow us to apply changes (eg, to experiment with bug xes), and if they don t work out, we can revert the changes back to the last good version of the code So before starting to debug, it is always best to check our code into the version control system so that we have a known position that we can revert to if we get into a mess There are many good cross-platform open source version control systems available this book uses Bazaar (bazaar-vcsorg), but other popular ones include Mercurial (mercurialseleniccom), Git (git-scmcom), and Subversion (subversiontigrisorg) Incidentally, both Bazaar and Mercurial are mostly written in Python None of these systems is hard to use (at least for the basics), but using any one of them will help avoid a lot of unnecessary pain.

Business Participation in the Modeling Process Creating the First Draft Preparing for Modeling Sessions Brainstorming the Framework Drafting the Initial Dimensions Drafting the Initial Fact Groups Documenting the Model Logging Questions and Issues Building the Business Measures Worksheet Preliminary Source to Target Data Map Completing or Fleshing Out the Model Working Through the Issues Completing the Documentation Working Through All the Data Elements Re ning the Model Business Reviews of the Model Small Business Reviews When Are You Done Gaining Final Commitment Expanding Business Data Over Time Enhancing Dimensions Adding More Fact Groups Re ecting on Business Realities: Advanced Concepts Supporting Multiple Perspectives: Multiple Hierarchies Tracking Changes in the Dimension: Slowly Changing Dimensions Depicting the Existence of a Relationship: Factless Fact Tables Linking Parts of a Transaction: Degenerate Dimensions Pulling Together Components: Junk Dimensions Multiple Instances of a Dimension: Role Playing Other Notation Dimension Connectors Clusters of Future Attributes Notation Summary Taking the Model Forward Translating the Business Dimensional Model Dimension Table Design ranslating Fact Groups Physical Database Design In Real Life A Glimpse into Giant Co Insight from Agile, Inc Summary. Barcode In .NET Using Barcode generator for . NET Control to generate, create barcode image in .Related: 

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