PCEP-30-02 3.2 tuple indexing, slic.txt

PCEP-30-02 3.2 tuple indexing, slicing, building, immutability, comparisons with lists, and nested structures:

1. How do you create an empty tuple in Python?
   A) tuple = ()
   B) tuple = {}
   C) tuple = []
   D) tuple = tuple()

2. What is the output of the following code?
   ```python
   t = (1, 2, 3, 4, 5)
   print(t[2])
   ```
   A) 1
   B) 2
   C) 3
   D) 4

3. Which of the following is TRUE about tuples in Python?
   A) Tuples are mutable
   B) Tuples are immutable
   C) Tuples can be modified after creation
   D) Tuples don't support indexing

4. What is the result of this operation?
   ```python
   (1, 2, 3) + (4, 5, 6)
   ```
   A) (1, 2, 3, 4, 5, 6)
   B) (5, 7, 9)
   C) Error
   D) ((1, 2, 3), (4, 5, 6))

5. How do you access the last element of a tuple 't' without knowing its length?
   A) t[-1]
   B) t[len(t)]
   C) t.last()
   D) t.end()

6. What is the output of this code?
   ```python
   t = (1, 2, 3, 4, 5)
   print(t[1:4])
   ```
   A) (1, 2, 3)
   B) (2, 3, 4)
   C) (2, 3, 4, 5)
   D) (1, 2, 3, 4)

7. Which of the following will raise an error?
   A) t = (1, 2, 3)
   B) t = (1,)
   C) t = (1)
   D) t = tuple([1, 2, 3])

8. What is the main difference between tuples and lists?
   A) Tuples use parentheses, lists use square brackets
   B) Tuples are immutable, lists are mutable
   C) Tuples can contain only integers, lists can contain any type
   D) Tuples are faster to process than lists

9. How can you check if an element exists in a tuple?
   A) if element in tuple:
   B) if tuple.contains(element):
   C) if tuple.has(element):
   D) if element.exists(tuple):

10. What is the output of this code?
    ```python
    t = (1, 2, 3, 4, 5)
    print(t[-2:])
    ```
    A) (4, 5)
    B) (5,)
    C) (1, 2, 3)
    D) Error

11. Which method can be used to count the occurrences of an element in a tuple?
    A) count()
    B) index()
    C) find()
    D) search()

12. What happens when you try to modify a tuple?
    A) The tuple is updated
    B) A new tuple is created
    C) A TypeError is raised
    D) Nothing happens

13. How do you create a tuple with a single element?
    A) t = (1)
    B) t = (1,)
    C) t = 1,
    D) Both B and C

14. What is the output of this code?
    ```python
    t1 = (1, 2, 3)
    t2 = (1, 2, 3)
    print(t1 == t2)
    ```
    A) True
    B) False
    C) Error
    D) None

15. Which of the following is a valid way to unpack a tuple?
    A) a, b, c = (1, 2, 3)
    B) (a, b, c) = [1, 2, 3]
    C) a, b, c = 1, 2, 3
    D) All of the above

16. What is the result of this operation?
    ```python
    (1, 2, 3) * 2
    ```
    A) (2, 4, 6)
    B) (1, 2, 3, 1, 2, 3)
    C) ((1, 2, 3), (1, 2, 3))
    D) Error

17. How can you convert a list to a tuple?
    A) tuple(list)
    B) list.to_tuple()
    C) tuple.from_list(list)
    D) cast(tuple, list)

18. What is the output of this code?
    ```python
    t = ([1, 2], [3, 4])
    t[0][0] = 5
    print(t)
    ```
    A) ([1, 2], [3, 4])
    B) ([5, 2], [3, 4])
    C) TypeError
    D) ([5, 2], [3, 4])

19. Which of the following is TRUE about tuples and lists?
    A) Tuples can be used as dictionary keys, lists cannot
    B) Lists can be used as dictionary keys, tuples cannot
    C) Both tuples and lists can be used as dictionary keys
    D) Neither tuples nor lists can be used as dictionary keys

20. What is the output of this code?
    ```python
    t = (1, 2, 3, 4, 5)
    print(t[::2])
    ```
    A) (1, 3, 5)
    B) (2, 4)
    C) (1, 2, 3)
    D) (3, 4, 5)

21. How can you create a tuple containing elements of different types?
    A) t = (1, "two", 3.0, [4, 5])
    B) t = tuple(1, "two", 3.0, [4, 5])
    C) t = Tuple(1, "two", 3.0, [4, 5])
    D) This is not possible in Python

22. What is the result of this operation?
    ```python
    len((1, 2, 3, (4, 5)))
    ```
    A) 4
    B) 5
    C) 6
    D) Error

23. Which of the following is a correct way to create a nested tuple?
    A) t = ((1, 2), (3, 4))
    B) t = [(1, 2), (3, 4)]
    C) t = {(1, 2), (3, 4)}
    D) Both A and B

24. What happens when you try to sort a tuple?
    A) The tuple is sorted in-place
    B) A new sorted tuple is returned
    C) A TypeError is raised
    D) Nothing happens

25. How can you concatenate two tuples t1 and t2?
    A) t1.extend(t2)
    B) t1 + t2
    C) t1.append(t2)
    D) concat(t1, t2)

Answers:
1. A, 2. C, 3. B, 4. A, 5. A, 6. B, 7. C, 8. B, 9. A, 10. A, 11. A, 12. C, 13. D, 14. A, 15. D, 16. B, 17. A, 18. B, 19. A, 20. A, 21. A, 22. A, 23. D, 24. C, 25. B