Random , if , elseif , logical operators

1. Random, if, elseif,logicaloperators random.randint(a, b)

2. A program can decide which statements to execute based on a condition ifradius < 0: print("Incorrectinput") else: area= radius * radius * math.pi print("Area is", area)

3. Boolean Types, Values, and Expressions A Boolean expression is an expression that evaluates to a Boolean value True orFalse.

4. Example radius = 1 Print(radius> 0) print(int(True)) print(bool(0)) You can also use the boolfunction to convert a numeric value to a Boolean value. Thefunction returns False if the value is 0; otherwise, it always returns True.

5. GeneratingRandomNumbers

6. GeneratingRandomNumbers Python also provides another function, andrange(a, b), for generating a random integerbetween a and b – 1, which is equivalent to randint(a, b – 1). For example,randrange(0, 10) and randint(0, 9) are the same. Since randintis more intuitive, thebook generally uses randintin the examples. You can also use the random() function to generate a random float r such that 0 <= r < 1.0.

7. ifStatements

8. SimpleIfDemo.py

9. CaseStudy: GuessingBirthdays

12. Two-Wayif-elseStatements

13. Exampleif-else ifradius >= 0: area= radius * radius * math.pi print("The area for the circle of radius", radius, "is", area) else: print("Negative input")

14. if-else ifnumber % 2 == 0: print(number, "is even.") else: print(number, "is odd.")

15. SubtractionQuiz.py

16. Nested if and Multi-Way if-elif-else

17. Nested if and Multi-Way if-elif-else

18. Zodiac

21. ComputingBodyMassIndex

23. LogicalOperators The logical operators not, and, and or can be used to create a composite condition. Sometimes, a combination of several conditions determines whether a statement is executed. You can use logical operators to combine these conditions to form a compound expression.

26. Case Study: Determining Leap Years

28. ConditionalExpressions A conditionalexpressionevaluatesanexpressionbased on a condition. You might want to assign a value to a variable that is restricted by certain conditions. For example, the following statement assigns 1 to y if x is greater than 0, and -1 to y if x is less than or equal to 0. ifx > 0: y = 1 else: y = -1 y = 1 if x > 0 else -1

29. Detecting the Location of an Object