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By Timothy A. Budd

Exploring Python takes an lively studying method which engages the scholar as an equivalent associate within the technique of studying the joys, academic, and strong programming language. This strategy instills conduct that scholars will hold with them all through their programming occupation and is helping them maintain and use the knowledge they've got learned.
Tim Budd is likely one of the best-known authors in laptop technological know-how and has a name for generating writing texts alongside the forefront of the self-discipline. Exploring Python offers an available and trustworthy advent into programming with the Python language.

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Predict the outcome in this case, and then try the program and see if it matches your prediction. Is the result very helpful? Can you think of a way, using if statements, to produce a more helpful result in this case and still produce the same result in the normal case? 0 Count = 0 Num = input Num 1 = 1 No Yes Sum = Sum + Num Count = Count + 1 Num = input Print Testing While Loops Just as guidelines exist for testing conditional statements, good guidelines are available for testing loops, such as the following: ⦁ ⦁ ⦁ If a loop can execute an indefinite number of times, try to come up with an input that will force the loop not to execute at all—that is, will force it to execute zero iterations.

Once you have the program working on these inputs, consider the guidelines presented earlier for testing conditional statements or loops. Do the test cases you have written already satisfy these guidelines? If not, create new test cases for these situations. Once you have the program working correctly with these new test cases, make sure you show them to the client to verify that the correct result is being produced. Step 6: Maintain the Program Few programs remain untouched once they are released for others to use: perhaps new bugs are discovered, or users decide they want new abilities that were not envisioned in the original design.

What will your program do then? The condition being tested by a while loop can be any true/false value. indd 34 1/6/09 12:09:49 PM Chapter 2 Creating Python Programs 35 number of items, and print their average. The user indicates the end of the input by typing the special value, –1. = -1: sum = sum + num count = count + 1 num = input("enter your number:") print "average is", sum / count What will happen if the user enters –1 the very first time, without entering any numbers? Predict the outcome in this case, and then try the program and see if it matches your prediction.

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