Python Exam 3 2025

A statement that controls the execution of other statements is called a - Correct Ans-control structure The best structure for implementing a multi-way decision in Python is - Correct Ans-if-elif-else What is the purpose of an if statement - Correct Ans-to choose whether or not to execute certain code Which of the following statements is true: -an if statement must have an else statement -an if statement must have an elif statement -An if statement must have both an elif and an else statement -An else statement must have a matching if if statement - Correct Ans--An else statement must have a matching if if statement Which of the following Python statements is invalid: -if x!=4: -if x = 4: -if x == 4: -if 2< x < 4: - Correct Ans-if x = 4: Planning a decision inside of another decision is an example of: - Correct Ans-nesting A structure in which one decision leads to another set of decisions, which leads to another set of decisions, etc., is called a decision _____ - Correct Ans-tree A multiple choice question is most similar to _______ - Correct Ans-multi-way decision Which of the following statements is true? -There is usually one algorithm to solve a problem -There is often more than one way to solve a problem and some ways may be more efficient than others -There is often more than one way to solve a problem but they are all equally efficient -all of the above -none of the above - Correct Ans--There is often more than one way to solve a problem and some ways may be more efficient than others What is the purpose of exception handling - Correct Ans-to handle errors gracefully so the program does not crash T or F A python while implements an indefinite loop - Correct Ans-True T or F The counted loop pattern uses an indefinite loop - Correct Ans-False T or F a while is a pre-test loop - Correct Ans-True A loop pattern that asks the user whether to continue on each iteration is called - Correct Ans-interactive loop A loop pattern that continues until a special value is input is called ______ - Correct Ans-sentinel loop Which of the following can be treated as boolean expression -an int expression -a float expresion -the result of a comparison operator(such as < or >) -all of the above - Correct Ans-All of the above Which of the following statements is true about the Python expression x == 3 or 4 -It is an invalid statement and the Python interpreter will indicate its a syntax error -It will be true if x is 3 of if x is 4, and false for any other values -It will always be false -It will always be true - Correct Ans-It will always be true A while loop written as while True - Correct Ans-Might be an infinite loop depending on what the loop body contains What would be the final value of total for the following program? total = 0 for i in range(10): for j in range(10): total = total + 1 - Correct Ans-100 the term for an operator that may not evaluate one of its sub-expressions is called - Correct Ans-short-circuit T or F Computers can generate truly random numbers - Correct Ans-false T or F Top-down design is also called stepwise refinement - Correct Ans-true T or F in top-down design, the main algorithm is written in terms of functions that don't exist yet - Correct Ans-True Which of the following statements is true about computer simulation -They model real world exactly -Once the sim is written, the input values can be tweaked to see how it affects the results -All computer sims are easy to write -All of the above -None of the above - Correct Ans--Once the sim is written, the input values can be tweaked to see how it affects the results Which of the following statements could be true about the following python code? from random import randrange for i in range (10): print(randrange(10)) -It might output the numbers 0-9 in that order -It might output 0-9 in some order -It might output 0 ten times -all of the above -none of the above - Correct Ans-all of the above A simulation that uses probabilistic events is called - Correct Ans-Monte Carlo The initial version of a system used in spiral development is called a - Correct Ans-prototype Which of the following is not a step in pure top-down design -repeat the process on smaller problems -Detail the algorithm in terms of its interfaces with smaller problems -Construct a simplified prototype of the system -Express the algorithm in terms of smaller problems - Correct Ans-Construct a simplified prototype of the system What is unit testing - Correct Ans-testing separate parts/units of the program separately What are the advantages of spiral development -It makes it easier to tackle a large rpoblem when you don't know ahead of time all the features your program must implement -It allows you to add new features and test them even if they weren't part of the initial requirements of the program -It allows you to simplify the original problem that may be too complicated to understand initially -All of the above -None of the above - Correct Ans-All of the above T or F New objects are created by invoking a constructor - Correct Ans-True T or F functions that live in objects are called methods - Correct Ans-True T or F In a Python class, the constructor is called __init__ - Correct Ans-True What python reserved word starts a class definition - Correct Ans-class A method definition is similar to a ____ - Correct Ans-Function definition T or F A simple decision can be implemented with