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43 / 45Dictionaries and Key-Value PairsHardPython Basics

What will be the result when you attempt to update a dictionary by adding a new key-value pair and then modifying an existing value?

employee_data = {'name': 'Vikram', 'age': 28}
employee_data['department'] = 'Engineering'
employee_data['age'] = 29
print(len(employee_data))
print(employee_data)

  1. 3 {'name': 'Vikram', 'age': 29, 'department': 'Engineering'}

  2. 2 {'name': 'Vikram', 'age': 29}

  3. 3 {'name': 'Vikram', 'age': 28, 'department': 'Engineering'}

  4. 4 {'name': 'Vikram', 'age': 29, 'age': 28, 'department': 'Engineering'}

Show answer & explanation

Correct answer

3 {'name': 'Vikram', 'age': 29, 'department': 'Engineering'}

Explanation

Adding a new key 'department' increases the dictionary size to 3. Modifying 'age' from 28 to 29 updates the existing value without changing the dictionary length. The final dictionary contains all three key-value pairs.

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All 45 Dictionaries and Key-Value Pairs questions

  1. 1.What is the primary purpose of using dictionaries in Python programming?
  2. 2.How do you create an empty dictionary in Python using the most common syntax?
  3. 3.What does the following code snippet output when executed?
  4. 4.Which of the following is a valid way to add a new key-value pair to an existing dictionary?
  5. 5.What is the output of the following code snippet?
  6. 6.How do you check whether a specific key exists in a dictionary?
  7. 7.What will be the output when you run the following code?
  8. 8.Which method would you use to retrieve all keys from a dictionary?
  9. 9.What is the output of the following code snippet?
  10. 10.How do you remove a key-value pair from a dictionary?
  11. 11.What will this code snippet output?
  12. 12.Which method returns all values from a dictionary as a view object?
  13. 13.What is the output of the following code?
  14. 14.How do you iterate through all key-value pairs in a dictionary?
  15. 15.What will be the output of this code snippet?
  16. 16.Predict the output of the following code snippet where Hari creates a dictionary and performs multiple operations on it
  17. 17.What will this code output when Prasath tries to access and modify dictionary values?
  18. 18.Debug the following code snippet where Ravi attempts to iterate through a dictionary and identify the issue
  19. 19.What will be the output when Hari runs this code that uses dictionary methods to retrieve information?
  20. 20.Predict the behavior of this code where Prasath attempts to create and manipulate a nested dictionary structure
  21. 21.What is the primary purpose of using dictionaries in Python instead of lists for storing related data?
  22. 22.Predict the output:
  23. 23.What will happen when Prasath tries to access a key that does not exist in a dictionary without using the get() method?
  24. 24.Predict the output:
  25. 25.What is the correct way to safely retrieve a value from a dictionary when the key might not exist?
  26. 26.Predict the output:
  27. 27.What does the update() method do when called on a dictionary with another dictionary as an argument?
  28. 28.Predict the output:
  29. 29.How can you iterate through both keys and values simultaneously in a dictionary using a single loop?
  30. 30.Predict the output:
  31. 31.What will be the output when Vikram executes this code to create a nested dictionary and access a value from the inner dictionary?
  32. 32.Predict the output:
  33. 33.What will be printed when Meera uses dictionary comprehension to create a new dictionary from an existing one?
  34. 34.Predict the output:
  35. 35.What will be the result when Isha tries to use the setdefault() method to add a new key-value pair to a dictionary?
  36. 36.Predict the output:
  37. 37.What will happen when Divya calls the clear() method on a dictionary and then tries to access a key?
  38. 38.Predict the output:
  39. 39.What will be the output when Pooja uses the copy() method to create a shallow copy of a dictionary and then modifies the copy?
  40. 40.Predict the output:
  41. 41.What is the primary purpose of using dictionaries in Python, and how do they differ fundamentally from lists in terms of data organization?
  42. 42.Predict the output of the following code snippet that demonstrates dictionary key access and the get() method behavior
  43. 43.What will be the result when you attempt to update a dictionary by adding a new key-value pair and then modifying an existing value?
  44. 44.Debug the following code to identify why the loop does not produce the expected output when iterating over dictionary keys and values
  45. 45.What is the output when you use the pop() method to remove a key-value pair from a dictionary, and what happens if you attempt to pop a…