For Loops
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. What does a for loop do?
2. for x in [10,20,30]:\n print(x)\nWhat prints?
3. for char in 'Hi':\n print(char)\nWhat prints?
4. What keyword follows 'for x'?
5. How many times does 'for i in range(3):' loop?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1for x in range(5) print(x) | AOutput: 6 | |
| 2for in range(5): print('hi') | BOk: Loop through list | |
| 3for char in 'hello': print(char) | CError: Missing colon after for | |
| 4for item in [1, 2, 3]: print(item) | DValid: Loop through string | |
| 5for i in range(3): print(i) | EError: Missing loop variable | |
| 6total = 0 for n in [1,2,3]: total += n print(total) | FOutput: 0 1 2 |
C
Definitions
for
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
___ i in [1, 2, 3]:
print(i)
2.
for i __ [1, 2, 3]:
print(i)
3.
for char in 'hello'_
print(char)
4.
for color __ ['red', 'blue']:
print(color)
5.
for i in _____(5):
print(i)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
total = 0
B
for i in [1, 2, 3]
C
total += i
D
print(i)
E
print('Sum:', total)
Question 2
A
total = 0
B
for i in [1, 2, 3]:
C
print(i)
D
total += i
E
print('Done')
Question 3
A
total = 0
B
For i in [1, 2, 3]:
C
total += i
D
print(i)
E
print('Sum:', total)
Question 4
A
total = 0
B
for i of [1, 2, 3]:
C
total += i
D
print(i)
E
print('Sum:', total)
Question 5
A
total = 0
B
for i in 5:
C
total += i
D
print('Sum:', total)
Answer Key
For Loops
Section A: Quick Questions
Q1
B — Loops through each item in a sequence
Q2
A — 10, 20, 30
Q3
B — H then i
Q4
A — in
Q5
A — 3 times
Section B: Match the Pairs
Q1
for x in range(5)
print(x) → Error: Missing colon after for
Q2
for in range(5):
print('hi') → Error: Missing loop variable
Q3
for char in 'hello':
print(char) → Valid: Loop through string
Q4
for item in [1, 2, 3]:
print(item) → Ok: Loop through list
Q5
for i in range(3):
print(i) → Output: 0
1
2
Q6
total = 0
for n in [1,2,3]:
total += n
print(total) → Output: 6
Section C: Definitions
Q1
for — Loop that iterates through each item in a sequence.~~inSection D: Fill in the Blanks
Q1
for i in [1, 2, 3]:
print(i)Q2
for i in [1, 2, 3]:
print(i)Q3
for char in 'hello':
print(char)Q4
for color in ['red', 'blue']:
print(color)Q5
for i in range(5):
print(i)Section E: Spot the Error
Q1
B — Missing colon at the end of the for line
Q2
C — The print line must be indented inside the for loop
Q3
B — for must be lowercase: For is not valid Python
Q4
B — Use 'in', not 'of': Python syntax is: for x in sequence:
Q5
B — Can't loop over a plain number: use range(5) to loop 5 times