Data Structures and Algorithms Using Python and C++ by David M. Reed

By David M. Reed

THIS publication is meant to be used in a standard college-level facts buildings direction (commonly referred to as CS2). This ebook assumes that scholars have discovered the elemental syntax of Python and been uncovered to using present sessions. most standard CS1 classes that use Python could have lined the entire worthwhile themes, and a few could have lined the various subject matters coated during this ebook. we've got chanced on that the majority scholars effectively finishing a CS1 path know the way to take advantage of periods, yet a lot of them desire extra adventure to benefit the right way to layout and write their very own periods.

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Example text

I pick a number between 1 and 100, and you try to guess what it is. Each time you guess, I will tell you if your guess is correct, too high, or too low. What is your strategy? If you play this game with a very young child, they might well adopt a strategy of simply guessing numbers at random. An older child might employ a systematic approach corresponding to linear search, guessing 1 , 2, 3, 4, and so on until the lnystery value is found. Of course, virtually any adult will first guess 50. If told that the number is higher, then the range of possible values is 50- 100.

This elegant alternative allows you to iterate through a list and, on each iteration, you are handed the next index along with the next item. Here's how the search looks using enumerate. # search3 . py def search ( it ems , target ) : f or i , item in enumerate ( items ) : if item == target : return i return 1 - Another approach would be to avoid the whole range/xrange/enumerate issue by using a while loop instead. # search4 . py def search ( it ems , target ) : i = 0 yhile i < len ( items) : if items [i] == target : return i i += 1 return - 1 1 In Python 3 .

Abstraction is used to simplify and reduce the amount of information a pro­ grammer needs to understand at any given moment when writing software. One particularly useful type of abstraction (functional abstraction) allows the separation of "what" from "how" and facilitates design by contract. 1 . 5 Exercises • • • 33 Program assertions document a program by stating what must be true at a given point of execution. Pre- and post conditions are special kinds of assertions that provide a convenient way to specify the behavior of a function or method.

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