Exercise 3-8 Solution Python Crash Course Chapter 3: Introducing Lists

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📘 Python Crash Course – Chapter 3: Introducing Lists – Exercise 3-8 Solution

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

📝 Exercise 3-8

Task:
Think of at least five places in the world you’d like to visit .
• Store the locations in a list . Make sure the list is not in alphabetical order .
• Print your list in its original order . Don’t worry about printing the list neatly, just print it as a raw Python list .
• Use sorted() to print your list in alphabetical order without modifying the actual list .
• Show that your list is still in its original order by printing it .
• Use sorted() to print your list in reverse alphabetical order without chang ing the order of the original list .
• Show that your list is still in its original order by printing it again .
• Use reverse() to change the order of your list . Print the list to show that its order has changed .
• Use reverse() to change the order of your list again . Print the list to show it’s back to its original order .
• Use sort() to change your list so it’s stored in alphabetical order . Print the list to show that its order has been changed .
• Use sort() to change your list so it’s stored in reverse alphabetical order . Print the list to show that its order has changed

✅ Solution Code:


location = ['india','america','japan','china','russia','finland']
print(location)

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

sorted_location =sorted(location)
print(f'Sorted Location : {sorted_location}')

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


print(f'Location list is still in Its Original order: {location}')

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

location.reverse()   # list is reversed
print(f"Now the Location List is Reversed : {location}")

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

location.reverse()   # list is reversed again
print(f"Now the Location List is Reversed again : {location}")

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


location.sort()
print(f"Now the Location List is sorted in ascending order  : {location}")

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

location.sort(reverse=True)
print(f"Now the Location List is sorted in descending order  : {location}")

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

🧠 Code Explanation:

This Python code demonstrates how to manipulate a list of locations using various list methods and functions. Here's how it works:

  1. Create a list:

    The variable location is assigned a list of places: ['india', 'america', 'japan', 'china', 'russia', 'finland']. The list is not in alphabetical order.

  2. Print the original list:

    The print() function is used to display the list in its original order.

  3. Sort the list temporarily:

    The sorted() function is used to display the list in alphabetical order without modifying the original list. The sorted list is stored in the variable sorted_location.

  4. Show the original list:

    The original list is printed again to confirm that it has not been modified.

  5. Reverse the list:

    The reverse() method is used to reverse the order of the list. The modified list is printed to show the change.

  6. Reverse the list again:

    The reverse() method is used again to restore the list to its original order. The modified list is printed to confirm the change.

  7. Sort the list in ascending order:

    The sort() method is used to permanently sort the list in alphabetical order. The sorted list is printed.

  8. Sort the list in descending order:

    The sort(reverse=True) method is used to permanently sort the list in reverse alphabetical order. The sorted list is printed.

🔍 Output:


['india', 'america', 'japan', 'china', 'russia', 'finland']
----------------------------------------------------------------------
Sorted Location : ['america', 'china', 'finland', 'india', 'japan', 'russia']   
----------------------------------------------------------------------
Location list is still in Its Original order: ['india', 'america', 'japan', 'china', 'russia', 'finland']
----------------------------------------------------------------------
Now the Location List is Reversed : ['finland', 'russia', 'china', 'japan', 'america', 'india']
----------------------------------------------------------------------
Now the Location List is Reversed again : ['india', 'america', 'japan', 'china', 'russia', 'finland']
----------------------------------------------------------------------
Now the Location List is sorted in ascending order  : ['america', 'china', 'finland', 'india', 'japan', 'russia']
----------------------------------------------------------------------
Now the Location List is sorted in descending order  : ['russia', 'japan', 'india', 'finland', 'china', 'america']
----------------------------------------------------------------------

📚 Related Exercises from Chapter 3:

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“The only way to learn a new programming language is by writing programs in it.”
– Dennis Ritchie

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