Exercise 4-10 Solution Python Crash Course Chapter 4: Working With Lists

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📘 Python Crash Course – Chapter 4: Working With Lists – Exercise 4-10 Solution

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

📝 Exercise 4-10

Task:
Using one of the programs you wrote in this chapter, add several lines to the end of the program that do the following:
• Print the message, The first three items in the list are: . Then use a slice to print the first three items from that program’s list .
• Print the message, Three items from the middle of the list are: . Use a slice to print three items from the middle of the list .
• Print the message, The last three items in the list are: . Use a slice to print the last three items in the list

✅ Solution Code:


num_list = list(range(1,11))

print("The first three items in the list are:")
print(num_list[0:3])

print("-----------------------------------------------------------")

print("Three items from the middle of the list are:")
print(num_list[4:7])

print("-----------------------------------------------------------")


print("The last three items in the list are:")
print(num_list[-3:])

print("-----------------------------------------------------------")

🧠 Code Explanation:

This Python code demonstrates how to use slicing to extract specific portions of a list. Here's how it works:

  1. Create a list of numbers:

    The variable num_list is assigned a list of numbers generated using range(1, 11), which creates a sequence of numbers from 1 to 10.

  2. Extract the first three items:

    The slice num_list[0:3] is used to extract the first three items from the list. The slice starts at index 0 and ends before index 3.

  3. Extract three items from the middle:

    The slice num_list[4:7] is used to extract three items from the middle of the list. The slice starts at index 4 and ends before index 7.

  4. Extract the last three items:

    The slice num_list[-3:] is used to extract the last three items from the list. The negative index -3 starts the slice three items from the end of the list, and the slice continues to the end.

This code demonstrates how to use slicing to access specific portions of a list in Python.

🔍 Output:


The first three items in the list are:
[1, 2, 3]
-----------------------------------------------------------
Three items from the middle of the list are:
[5, 6, 7]
-----------------------------------------------------------
The last three items in the list are:
[8, 9, 10]
-----------------------------------------------------------

📚 Related Exercises from Chapter 4:

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