Exercise 5-9 Solution Python Crash Course Chapter 5: if Statements

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📘 Python Crash Course – Chapter 5: if Statements – Exercise 5-9 Solution

Welcome to another solution from Python Crash Course by Eric Matthes.

📝 Exercise 5-9

Task:
create a list of users .make sure the list of users is not empty .
• If the list is empty, print the message We need to find some users!
• Remove all of the usernames from your list, and make sure the correct message is printed

✅ Solution Code:


users = ["Tony","Hulk","Bruce","admin","Natasha"]
#users = []    #empty user list
if len(users) == 0:
    print(" We need to find some users!")
else:
    for user in users :
        print(f'Hello {user}')

🧠 Code Explanation:

This Python code demonstrates how to handle a list of users and check whether the list is empty or contains usernames. Here's how it works:

  1. Create a list of users:

    The variable users is assigned a list containing usernames: ["Tony", "Hulk", "Bruce", "admin", "Natasha"]. Alternatively, the list can be set to empty by uncommenting users = [].

  2. Check if the list is empty:

    An if statement checks whether the length of the users list is 0 using the len() function. If the list is empty, a message is displayed indicating that new users need to be found.

  3. Iterate through the list:

    If the list is not empty, the else block is executed. A for loop iterates through each username in the users list, and a personalized greeting is displayed for each user.

This code demonstrates how to check for an empty list and handle its contents dynamically using conditional logic and loops.

🔍 Output:


Hello Tony
Hello Hulk
Hello Bruce
Hello admin
Hello Natasha

📚 Related Exercises from Chapter 5:

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— Harold Abelson

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