Python Dictionary Exercises

:books: What you'll learn

• Create and manipulate Python dictionaries
• Access dictionary items, keys, and values
• Add, modify, and delete dictionary entries
• Work with nested dictionaries
• Loop through dictionary elements

Total Time: 45-60 minutes

:computer: Getting Started

1. Click the link here
2. Make a copy of the Colab Notebook into your Google Drive
3. Write the program using loops to show the outcome for each question

:bulb: :bulb: Remember to run each code cell in order as you complete the exercises!

Question One: Basic Dictionary Operations

⏱️ Time: 15-20 minutes

Part One: Create a dictionary

1. Create a dictionary named students_id

2. Print the dictionary to verify it's created correctly

:information_source: Info :memo: You may copy the code below to create the dictionary:

python

students_id = {111: "Harry Potter", 112: "Draco Malfoy", 113: "Hermione Granger"}

Expected output:

output

{111: 'Harry Potter', 112: 'Draco Malfoy', 113: 'Hermione Granger'}

Part 2: Access a specific value

1. Access the value of students_id[111] in the dictionary
2. Print the result

Expected output:

output

Harry Potter

Part 3: Access all dictionary components

1. Access and print all items of the dictionary
2. Access and print all keys of the dictionary
3. Access and print all values of the dictionary

Expected output:

output

dict_items([(111, 'Harry Potter'), (112, 'Draco Malfoy'), ]($2)])
dict_keys([111, 112, 113])
dict_values(['Harry Potter', 'Draco Malfoy', 'Hermione Granger'])

Part 4: Loop through dictionary items

1. Use a for loop to iterate through all items in the dictionary
2. Print each item

Expected output:

output

(111, 'Harry Potter')
(112, 'Draco Malfoy')
(113, 'Hermione Granger')

Part 5: Add a new entry

1. Add a new student called "Ron Weasley" with id 114 to the dictionary
2. Print the updated dictionary

Expected output:

output

{111: 'Harry Potter', 112: 'Draco Malfoy', 113: 'Hermione Granger', 114: 'Ron Weasley'}

Part 6: Modify an existing entry

1. Change the student name "Hermione Granger" to "Terry Boot"
2. Print the updated dictionary

Expected output:

output

{111: 'Harry Potter', 112: 'Draco Malfoy', 113: 'Terry Boot', 114: 'Ron Weasley'}

Part 7: Delete an entry

1. Delete the student named "Draco Malfoy" from the dictionary
2. Print the updated dictionary tip :bulb: To delete by value, you'll need to find the key first!

Expected output:

{111: 'Harry Potter', 113: 'Terry Boot', 114: 'Ron Weasley'}

Question 2: Lists in Dictionary

⏱️ Time: 10-15 minutes

Given Data:

Task:

1. Create a nested dictionary (Lists in Dictionary) using the data in the table above
2. Structure the dictionary with 'name' and 'country' as keys, each containing a list of values

Expected output:

{'name': ['Viktor Axelsen', 'Lee Zii Jia', 'Loh Kean Yew', 'Jonatan Christie'], 'country': ['Denmark', 'Malaysia', 'Singapore', 'Indonesia']}

Advanced Level: Dictionaries in Dictionary

⏱️ Time: 15-20 minutes

Tasks:

1. Create a nested dictionary named players (Dictionaries in Dictionary) using data from the Question 2 table

   :information_source: Info

:memo: Run the first code cell under Advanced Level section in the Colab notebook

2. Access and print all player1 values from the dictionary

3. Access and print player2's name from the dictionary

4. Access and print player3's country from the dictionary

5. Add a new player to the dictionary:

   Example player data:

   players	name	country
   player5	Kento Momota	Japan

   Then print the updated dictionary

6. Delete player4 from the dictionary and print the result to verify the update

:bulb: Helpful Resources

tip Need help with nested dictionaries?

• Check out this tutorial: Python Nested Dictionary Guide
• Remember: Nested dictionaries can contain either lists or other dictionaries as values

:hammer_and_wrench: Troubleshooting

Common Issues:

• KeyError: Make sure the key exists before accessing it
• TypeError: Check that you're using the correct syntax for nested structures
• IndentationError: Python is sensitive to indentation - use consistent spacing

:emoji: Submission Instructions

:warning: Warning Before submitting:

1. :white_check_mark: Complete all questions (Question 1, Question 2, and Advanced Level)
2. :white_check_mark: Test your code to ensure all outputs match the expected results
3. :white_check_mark: Save your Colab notebook
4. :white_check_mark: Review your answers one final time

:information_source: Ready to submit? :link: Submit your exercise here

Your responses will help track your progress in the course.