Nested Lists
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. What makes a set special?
2. How do you create an empty set?
3. {1, 2, 2, 3} becomes?
4. Can you access set items by index?
5. How do you add to a set?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1s = {1, 2, 3} print(s[0]) | AError: {} creates dict, not set | |
| 2empty = {} | BError: Sets have no index | |
| 3s = {1, 2, 2, 3} | COutput: 3 | |
| 4s = set() s.add(5) | DOutput: True | |
| 5s = {3, 1, 2, 1} print(len(s)) | EValid: Becomes {1, 2, 3} | |
| 6s = {1, 2, 3} print(2 in s) | FOk: Empty set then add 5 |
C
Definitions
Set
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
s = ___()
2.
s = {1, 2, 3}
s.___(4)
3.
s = {1, 2, 3}
s._______(2)
4.
print(3 __ {1, 2, 3})
5.
s = {1, 2, 2, 3}
print(___(s))
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
# Create an empty set
B
s = {}
C
s.add(1)
D
print('Set:', s)
Question 2
A
s = {1, 2, 3}
B
s.append(4)
C
print('Set:', s)
D
print('Done')
Question 3
A
s = {1, 2, 3}
B
first = s[0]
C
print('First:', first)
D
print('Done')
Question 4
A
s = {1, 2, 3}
B
s.remove(5)
C
print('Set:', s)
D
print('Done')
Question 5
A
s = {[1, 2], [3, 4]}
B
label = 'Coords'
C
print('Set:', s)
D
print('Done')
Answer Key
Nested Lists
Section A: Quick Questions
Q1
B — Items are unique no duplicates
Q2
A — set()
Q3
A — {1, 2, 3}
Q4
B — No sets are unordered
Q5
A — .add()
Section B: Match the Pairs
Q1
s = {1, 2, 3}
print(s[0]) → Error: Sets have no index
Q2
empty = {} → Error: {} creates dict, not set
Q3
s = {1, 2, 2, 3} → Valid: Becomes {1, 2, 3}
Q4
s = set()
s.add(5) → Ok: Empty set then add 5
Q5
s = {3, 1, 2, 1}
print(len(s)) → Output: 3
Q6
s = {1, 2, 3}
print(2 in s) → Output: True
Section C: Definitions
Q1
Set — An unordered collection of unique items in curly braces.~~set()Section D: Fill in the Blanks
Q1
s = set()Q2
s = {1, 2, 3}
s.add(4)Q3
s = {1, 2, 3}
s.discard(2)Q4
print(3 in {1, 2, 3})Q5
s = {1, 2, 2, 3}
print(len(s))Section E: Spot the Error
Q1
B — {} creates an empty dict, not a set. Use set() for an empty set.
Q2
B — Sets use .add(), not .append() (that's for lists)
Q3
B — Sets are unordered: you can't access items by index
Q4
B — 5 is not in the set: remove() raises KeyError. Use discard() instead.
Q5
A — Lists can't be in sets (unhashable). Use tuples instead.