Python Selection and Iteration Worksheets for High School CS

📚 Topic Summary: Python Selection & Iteration Fundamentals

Welcome to the exciting world of Python programming for high school Computer Science! Today, we're diving into two fundamental concepts that allow your programs to make decisions and repeat actions: Selection and Iteration. 💡 Selection, often implemented using if, elif, and else statements, empowers your code to choose different paths based on whether certain conditions are true or false. Think of it like a choose-your-own-adventure story for your computer!

Iteration, on the other hand, is all about repetition. 🔄 With for loops and while loops, you can instruct your program to execute a block of code multiple times. A for loop is perfect when you know how many times you want to repeat something (like going through a list of items), while a while loop keeps going as long as a specific condition remains true. Mastering these concepts is crucial for building dynamic and efficient Python programs!

📝 Part A: Vocabulary Challenge

Match the term on the left with its correct definition on the right. Write the letter of the definition next to the term.

• 🧐 1. Selection:
• ➡️ 2. Iteration:
• 🔀 3. Conditional Statement:
• 🔁 4. Loop:
• 🎯 5. Boolean Expression:

Definitions:

• A. ⚙️ A programming construct that repeats a block of code multiple times.
• B. ✅ A statement that executes different code blocks based on whether a condition is true or false.
• C. 🧐 The process of making decisions in a program based on certain conditions.
• D. 🔄 The process of repeatedly executing a block of code.
• E. 💡 An expression that evaluates to either True or False.

✍️ Part B: Fill in the Blanks

Complete the following paragraph using the words provided below. Each word is used once.

(for, if, True, while, else, condition)

In Python, a(n) _________ statement allows a program to execute different code based on a specific _________. If the primary check is _________, its block runs; otherwise, the program might check an elif or fall to the _________ block. For repeating tasks, a _________ loop is ideal when you know the number of repetitions, such as iterating through a list. Alternatively, a _________ loop continues as long as its governing expression remains true.

🤔 Part C: Critical Thinking Challenge

Imagine you are writing a Python program for a simple game where a user needs to guess a secret number between 1 and 10. Describe how you would use both selection and iteration concepts to allow the user to keep guessing until they get the number right, providing feedback (e.g., "Too high," "Too low," "Correct!") after each guess. Be specific about which Python keywords you would use for each concept.