Module 8 Quiz

1. Which of the following correctly creates a dictionary?

d = ["name": "Alice"] d = {"name": "Alice"} d = ("name": "Alice") d = <"name": "Alice">

2. What happens when you access a key that does not exist using square brackets?

It returns None It returns 0 It raises a KeyError It creates the key with a default value

3. What does my_dict.get("key", "default") return if "key" is not in my_dict?

None "key" "default" It raises a KeyError

4. What does my_dict.items() return?

A list of keys A list of values A view of key-value pairs as tuples The number of items in the dictionary

5. Which of the following can be used as a dictionary key?

A list A dictionary A tuple A set

6. What is the output of this code?

d = {"a": 1, "b": 2}
d["a"] = 10
d["c"] = 3
print(len(d))

2 3 4 Error

7. Which of the following creates a single-element tuple?

t = (5) t = (5,) t = [5] t = {5}

8. What does tuple unpacking allow you to do?

Add elements to a tuple Assign each element to a separate variable Remove elements from a tuple Convert a tuple to a dictionary

9. Why can't you use a list as a dictionary key?

Lists are too large Lists are mutable (they can change) Lists do not support indexing Python does not allow it for performance reasons

10. What is the output of this code?

t = (1, 2, 3, 2, 2)
print(t.count(2))

1 2 3 5

11. What does pop() do when called on a dictionary?

Removes and returns the last item Removes a key-value pair and returns the value Returns a copy of the dictionary Removes all items from the dictionary

12. Which data structure would you choose to store a fixed (x, y) coordinate pair?

List Dictionary Tuple String