04.02 Data Structures In Python - Quiz

Check your understanding

1. How do you access the element in the second row, third column of a 2D list called matrix?

   • matrix[1][2] { data-correct }
   • matrix[2][3]
   • matrix[2][1]
   • matrix[3][2]

2. Which Python operation is used to add an element to the end of a list?

   • insert()
   • add()
   • append() { data-correct }
   • push()

3. In a stack implemented using a Python list, which operation removes the top element?

   • remove()
   • pop() { data-correct }
   • delete()
   • pull()

4. How do you safely access a dictionary value that might not exist?

   • Use try/except with KeyError
   • Use the get() method { data-correct }
   • Check with if key in dict first
   • All of the above

5. Which data structure would be most efficient for implementing a simple undo feature?

   • Dictionary
   • 2D List
   • Stack { data-correct }
   • Tree

6. What does this code do?

   tree = {"name": "root", "children": [{"name": "child1", "children": []}]}
   

   • Creates a 2D array
   • Creates a simple tree structure using nested dictionaries { data-correct }
   • Creates a stack
   • Creates a hash table

7. When reading CSV files in Python, which module should you import?

   • file
   • csv { data-correct }
   • io
   • data

8. What is the result of my_list.pop(1) on the list [10, 20, 30, 40]?

   • Returns 10, list becomes [20, 30, 40]
   • Returns 20, list becomes [10, 30, 40] { data-correct }
   • Returns 30, list becomes [10, 20, 40]
   • Causes an error

9. Which Python data type is used to implement hash tables?

   • List
   • Tuple
   • Dictionary { data-correct }
   • Set

10. In a 2D list representing a grade book, how would you calculate the average grade for the first student?

    • sum(grades[0]) / len(grades[0]) { data-correct }
    • sum(grades) / len(grades)
    • average(grades[0])
    • grades[0].average()

11. What does csv.DictReader() do compared to csv.reader()?

    • Reads files faster
    • Returns each row as a dictionary with column headers as keys { data-correct }
    • Reads only the headers
    • Automatically sorts the data

12. Which operation is used to add an element at a specific position in a Python list?

    • append()
    • add()
    • insert() { data-correct }
    • place()