📘 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:
-
Create a list of numbers:
The variable
num_listis assigned a list of numbers generated usingrange(1, 11), which creates a sequence of numbers from 1 to 10. -
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. -
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. -
Extract the last three items:
The slice
num_list[-3:]is used to extract the last three items from the list. The negative index-3starts 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:
- ➤ Exercise 4-1 | Pizzas
- ➤ Exercise 4-2 | Animals
- ➤ Exercise 4-3 | Counting to Twenty
- ➤ Exercise 4-4 | One Million
- ➤ Exercise 4-5 | Summing a Million
- ➤ Exercise 4-6 | Odd Numbers
- ➤ Exercise 4-7 | Threes
- ➤ Exercise 4-8 | Cubes
- ➤ Exercise 3-9 | Cube Comprehension
- ➤ Exercise 4-10 | Slices
- ➤ Exercise 4-11 | My Pizzas, Your Pizzas
- ➤ Exercise 4-12 | More Loops
- ➤ Exercise 4-13 | Buffet
- ➤ Exercise 4-14 | PEP 8
- ➤ Exercise 4-15 | Code Review
🔗 Connect With Us:
“The only way to learn a new programming language is by writing programs in it.”
– Dennis Ritchie
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