Python PCEP Comparison Operators And Conditional Execution
- 1. Module 2 Data Collections – Lists, Tuples, and Dictionaries Comparison operators and conditional execution
- 2. Module Objective In this module, you will cover the following topics: • the Boolean data type; • relational operators; • making decisions in Python (if, if-else, if-elif,else) • how to repeat code execution using loops (while, for) • how to perform logic and bitwise operations in Python; • lists in Python (constructing, indexing, and slicing; content manipulation) • how to sort a list using bubble-sort algorithms; • multidimensional lists and their applications.
- 3. Module 2 Comparison operators &Conditional execution Questions Yes, this is true No, this is false Probably yes Let me think Comparison: equality operator Equality == • 2 == 2 True • 2 == 2. True • 1 ==2 False Inequality != • • var = 0 Print(var != 0) var = 1 Print(var != 0)
- 4. Module 2 Comparison operators &Conditional execution Priority Operator 1 +, 2 unary 2 ** 3 *, /. //, % 4 +, - binary 5 <, <=, >, >= 6 ==, != Comparison operators greater than > • black_sheep > white_sheep greater than or equal to >= • centigrade_outside >= 0.0 less than < • current_velocity_mph < 85 less than or equal to <= • current_velocity_mph <= 85
- 5. Module 2 Comparison operators &Conditional execution Conditions & Conditional execution if sheep_counter >= 120: make_a_bed() take_a_shower() sleep_and_dream() feed_the_sheepdogs() If the weather is good, we'll go for a walk then, we'll have lunch. if the_weather_is_good: go_for_a_walk() have_lunch() Conditionally executed statements have to be indented
- 6. Module 2 Comparison operators &Conditional execution if-else statement if true_or_false_condition: perform_if_condition_true else: perform_if_condition_false if the_weather_is_good: go_for_a_walk() else: go_to_a_theater() have_lunch() if the_weather_is_good: if nice_restaurant_is_found: have_lunch() else: eat_a_sandwich() else: if tickets_are_available: go_to_the_theater() else: go_shopping()
- 7. Module 2 Comparison operators &Conditional execution elif statement if the_weather_is_good: go_for_a_walk() elif tickets_are_available: go_to_the_theater() elif table_is_available: go_for_lunch() else: play_chess_at_home() If the weather is fine, we'll go for a walk. otherwise if we get tickets, we'll go to the theater otherwise if there are free tables at the restaurant, we'll go for lunch if all else fails, we'll return home and play chess.
- 8. Module 2 Comparison operators &Conditional execution Analyzing code samples 1 # Read two numbers number1 = int(input("Enter the first number: ")) number2 = int(input("Enter the second number: ")) # Choose the larger number if number1 > number2: larger_number = number1 else: larger_number = number2 # Print the result print("The larger number is:", larger_number) # Read two numbers number1 = int(input("Enter the first number: ")) number2 = int(input("Enter the second number: ")) # Choose the larger number if number1 > number2: larger_number = number1 else: larger_number = number2 # Print the result print("The larger number is:", larger_number)
- 9. Module 2 Comparison operators &Conditional execution # Read three numbers number1 = int(input("Enter the first number: ")) number2 = int(input("Enter the second number: ")) number3 = int(input("Enter the third number: ")) # We temporarily assume that the first number is the largest one. # We will verify this soon. largest_number = number1 # We check if the second number is larger than current largest_number # and update largest_number if needed. if number2 > largest_number: largest_number = number2 # We check if the third number is larger than current largest_number # and update largest_number if needed. if number3 > largest_number: largest_number = number3 # Print the result print("The largest number is:", largest_number) Analyzing code samples 2
- 10. Module 2 Comparison operators &Conditional execution Pseudocode & introduction # Read three numbers. number1 = int(input("Enter the first number: ")) number2 = int(input("Enter the second number: ")) number3 = int(input("Enter the third number: ")) # Check which one of the numbers is the greatest # and pass it to the largest_number variable. largest_number = max(number1, number2, number3) # Print the result. print("The largest number is:", largest_number) pseudocode
- 11. Module 2 Comparison operators &Conditional execution Key takeaways •Comparison operators: ==, !=, >, >=, <, <= •Conditional statement: •if •if-else •if-elif-else •Nested
- 12. Module 2 Comparison operators &Conditional execution LAB Practice 10. Questions and answers 11. Comparison operators and conditional execution 12. Essentials of if-else statement 13. Essentials of if-else statement (1)