Sets – Operations
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. What is a list of dictionaries?
2. people = [{'name':'Al'}]\npeople[0]['name'] returns?
3. d = {'items': [1,2,3]}\nd['items'][0] returns?
4. Why combine lists and dicts?
5. How do you add a dict to a list of dicts?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1people = [{'name':'Ali'}] print(people['name']) | AError: people is a list, use [0] | |
| 2d = {'tags': ['a','b']} print(d['tags']['a']) | BOk: Append to list inside dict | |
| 3people = [{'name':'Ali'},{'name':'Bo'}] people[0]['name'] | CError: Use integer index for list | |
| 4d = {'nums': [1,2,3]} d['nums'].append(4) | DOutput: Ali Bo | |
| 5p = [{'n':'Ali'},{'n':'Bo'}] for x in p: print(x['n']) | EValid: Returns 'Ali' | |
| 6d = {'c':['r','g']} print(d['c'][1]) | FOutput: g |
C
Definitions
List of dicts
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
people = [{'name': 'Alice'}]
print(people[_]['name'])
2.
d = {'items': [1, 2, 3]}
print(d['items'][_])
3.
people = []
people.______( {'name': 'Bob'} )
4.
for person __ people:
print(person['name'])
5.
student = {'scores': [90, 85]}
student['scores'].______(95)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
people = [{'name': 'Alice'}]
B
greeting = people['name']
C
print('Hello,', greeting)
D
print('Done')
Question 2
A
people = [{'name': 'Alice'}]
B
greeting = people[0][0]
C
print('Hello,', greeting)
D
print('Done')
Question 3
A
d = {'items': [1, 2]}
B
d['items'].add(3)
C
print('Items:', d['items'])
D
print('Done')
Question 4
A
people = {'name': 'Alice'}, {'name': 'Bob'}
B
first = people[0]['name']
C
print('First:', first)
D
print('Count:', len(people))
Question 5
A
d = {'scores': [90, 85]}
B
print(d.scores[0])
Answer Key
Sets – Operations
Section A: Quick Questions
Q1
A — A list where each item is a dictionary
Q2
B — 'Al'
Q3
A — 1
Q4
A — To store structured records
Q5
B — .append({'key': 'val'})
Section B: Match the Pairs
Q1
people = [{'name':'Ali'}]
print(people['name']) → Error: people is a list, use [0]
Q2
d = {'tags': ['a','b']}
print(d['tags']['a']) → Error: Use integer index for list
Q3
people = [{'name':'Ali'},{'name':'Bo'}]
people[0]['name'] → Valid: Returns 'Ali'
Q4
d = {'nums': [1,2,3]}
d['nums'].append(4) → Ok: Append to list inside dict
Q5
p = [{'n':'Ali'},{'n':'Bo'}]
for x in p:
print(x['n']) → Output: Ali
Bo
Q6
d = {'c':['r','g']}
print(d['c'][1]) → Output: g
Section C: Definitions
Q1
List of dicts — A list where each element is a dictionary like records.~~list[i]['key']Section D: Fill in the Blanks
Q1
people = [{'name': 'Alice'}]
print(people[0]['name'])Q2
d = {'items': [1, 2, 3]}
print(d['items'][0])Q3
people = []
people.append( {'name': 'Bob'} )Q4
for person in people:
print(person['name'])Q5
student = {'scores': [90, 85]}
student['scores'].append(95)Section E: Spot the Error
Q1
B — people is a list: must index first: people[0]['name']
Q2
B — Dicts use keys not indices. Use ['name'] not [0].
Q3
B — Lists use .append(), not .add() (that's for sets)
Q4
A — Missing square brackets: this creates a tuple, not a list
Q5
B — Use bracket notation d['scores'], not dot notation d.scores