sources. . Definite loops are loops that execute a known number of times. The Python for statement is a definite loop that iterates through a sequence of values. A Python list is often used in a for loop to provide a sequence of values for the loop. . One important use of a for statement is in implementing a counted loop, which is a loop designed specifically for the purpose of repeating some portion of the program a specific number of times. A counted loop in Python is created by using the built-in range function to produce a suitably sized sequence of numbers. 2.9 Exercises Review Questions True/False 1. The best way to write a program is to immediately type in some code and then debug it until it works. 2. An algorithm can be written without using a programming language. 3. Programs no longer require modification after they are written and de bugged. 4. Python identifiers must start with a letter or underscore. 5. Keywords make good variable names. 6. Expressions are built from literals, variables, and operators. 52 Chapter 2. Writing Simple Programs 7. In Python, x= x + 1 is a legal statement. 8. Python does not allow the input of multiple values with a single statement. 9. A counted loop is designed to iterate a specific number of times, 10. In a flowchart, diamonds are used to show statement sequences, angles are used for decision points. Multiple Choice 1. Which of the following is not a step in the software development process? a) specification b) testing/Debugging c) fee setting d) maintenance 201 2. What is the correct formula for converting Celsius to Fahrenheit? a) F=9/5(C) +32 b) F= 5/9(C) -32 c) F= B-4AC d) F= 212-32 100-0 and 4. Which of the following is not a legal identifier? a) spam b) spam c) 2spam d) spam4U 3. The process of describing exactly what a computer program will do to solve a problem is called a) design b) implementation c) programming d) specification 5. Which of the following are not used in expressions? a) variables b) statements c) operators d) literals rect. 7. Which of the following is not a part of the IPO pattern? a) input b) program c) process d) output 6. Fragments of code that produce or calculate new data values are called a) identifiers b) expressions productive clauses d) assignment statements 8. The template for in range ( ) describes a) a general for loop b) an assignment statement c) a flowchart d) a counted loop 10. Dis 9. Which of the following is the most accurate model of assignment in Python? b) variable-as-box a) sticky-note c) simultaneous d) plastic-scale 2.9. Exercises 10. In Python, getting user input is done with a special expression called a) for b) read c) simultaneous assignment d) input iscussion