List length and membership test in Python - Mini Project: Build & Apply

List length and membership test

📖 Scenario: You are organizing a small party and have a list of guests who have confirmed their attendance.You want to check how many guests are coming and whether a special friend is on the list.

🎯 Goal: Create a list of guests, count how many guests are coming, check if a special friend is attending, and print the results.

📋 What You'll Learn

Create a list called guests with the exact names: 'Alice', 'Bob', 'Charlie', 'Diana'

Create a variable called special_friend and set it to 'Charlie'

Create a variable called guest_count that stores the length of the guests list

Create a variable called is_special_friend_coming that checks if special_friend is in the guests list

Print the number of guests and whether the special friend is coming exactly as shown

💡 Why This Matters

🌍 Real World

Managing guest lists for events or parties is a common task. Knowing how to count attendees and check if important people are coming helps with planning.

💼 Career

This teaches basic list handling and condition checking, foundational skills for data processing, user management, and many programming jobs.

1

Create the guest list

Create a list called guests with these exact names: 'Alice', 'Bob', 'Charlie', 'Diana'

Python

# Create the guests list with the exact names
# Your code here

Need a hint?

Use square brackets [] to create a list and separate names with commas.

2

Set the special friend

Create a variable called special_friend and set it to the string 'Charlie'

Python

guests = ['Alice', 'Bob', 'Charlie', 'Diana']
# Create the special_friend variable
# Your code here

Need a hint?

Use an equals sign = to assign the string 'Charlie' to special_friend.

3

Count guests and check membership

Create a variable called guest_count that stores the length of the guests list using the len() function. Then create a variable called is_special_friend_coming that checks if special_friend is in the guests list using the in keyword.

Python

guests = ['Alice', 'Bob', 'Charlie', 'Diana']
special_friend = 'Charlie'
# Create guest_count using len(guests)
# Create is_special_friend_coming using 'in' keyword
# Your code here

Need a hint?

Use len(guests) to get the number of guests. Use special_friend in guests to check if the friend is coming.

4

Print the results

Print the number of guests using print(f"Number of guests: {guest_count}") and print whether the special friend is coming using print(f"Is special friend coming? {is_special_friend_coming}")

Python

guests = ['Alice', 'Bob', 'Charlie', 'Diana']
special_friend = 'Charlie'
guest_count = len(guests)
is_special_friend_coming = special_friend in guests
# Print the number of guests
# Print if the special friend is coming
# Your code here

Need a hint?

Use print() with f-strings to show the results clearly.