Scratch repeat block as a for loop
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which Python code does the same job as the Scratch block 'repeat 10'?
2. In a Scratch 'repeat 10' block, the blocks inside the C-shape are the ones that repeat. How does Python show which lines are inside the loop?
3. Which for loop line has the correct syntax?
4. What values does i take in for i in range(10):?
5. How many times does this code print Hi?
for i in range(10):
print('Hi')
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1for i in range(10): | APython's version of the Scratch repeat 10 block: it repeats the indented lines 10 times | |
| 2for i in range(5): print(i) | BThe print line is not indented, so Python does not know it is inside the loop. It should be indented 4 spaces. | |
| 3A Scratch repeat 4 block with a move block inside it becomes a for loop with the move line indented underneath | Cfor i in range(4): print("move") | |
| 4A Scratch repeat 3 block with two blocks inside it becomes a for loop with both lines indented the same amount | DThe colon is missing at the end of the for line, so Python gives a syntax error. It should be for i in range(10): | |
| 5for i in range(10) print("Hi") | EPrints 0, 1, 2, 3, 4 because the counter i starts at 0 and the loop runs 5 times | |
| 6for i in range(10): print("Hi") | Ffor i in range(3): print("jump") print("spin") |
C
Definitions
for i in range(10):
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
for i in _____(10):
print("Jump")
2.
# Scratch: repeat 10
for i in range(__):
print("Clap")
3.
___ i in range(5):
print("Step")
4.
for i in range(3):
print(_)
5.
for i in range(3):
print(i + _)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
print("Start")
B
for i in range(10):
C
print("Step)
Question 2
A
count = 0
B
for i in range(10)
C
count = count + 1
Question 3
A
for i in range[10]:
B
print("Jump")
C
print("Done")
Question 4
A
print("Dance time")
B
For i in range(10):
C
print("Spin")
Question 5
A
for i in range(10):
B
print("Move")
C
print("Turn")
D
Print("Finished")
Answer Key
Scratch repeat block as a for loop
Section A: Quick Questions
Q1
A — for i in range(10):
Q2
A — They are indented underneath the for line
Q3
B — for i in range(10):
Q4
B — 0, 1, 2, ... 9
Q5
A — 10 times
Section B: Match the Pairs
Q1
for i in range(10): → Python's version of the Scratch repeat 10 block: it repeats the indented lines 10 times
Q2
for i in range(5):
print(i) → Prints 0, 1, 2, 3, 4 because the counter i starts at 0 and the loop runs 5 times
Q3
A Scratch repeat 4 block with a move block inside it becomes a for loop with the move line indented underneath → for i in range(4):
print("move")
Q4
A Scratch repeat 3 block with two blocks inside it becomes a for loop with both lines indented the same amount → for i in range(3):
print("jump")
print("spin")
Q5
for i in range(10)
print("Hi") → The colon is missing at the end of the for line, so Python gives a syntax error. It should be for i in range(10):
Q6
for i in range(10):
print("Hi") → The print line is not indented, so Python does not know it is inside the loop. It should be indented 4 spaces.
Section C: Definitions
Q1
for i in range(10): — Python's version of the Scratch repeat 10 block. The lines indented under it run 10 times, and i counts from 0 to 9.Section D: Fill in the Blanks
Q1
for i in range(10):
print("Jump")Q2
# Scratch: repeat 10
for i in range(10):
print("Clap")Q3
for i in range(5):
print("Step")Q4
for i in range(3):
print(i)Q5
for i in range(3):
print(i + 1)Section E: Spot the Error
Q1
C — The string is missing its closing quote. The line inside the loop should be ' print("Step")'.
Q2
B — The for line must end with a colon. It should be 'for i in range(10):'.
Q3
A — range uses round brackets, not square brackets. It should be 'for i in range(10):'.
Q4
B — Python is case sensitive, so 'for' must be lowercase. It should be 'for i in range(10):'.
Q5
D — print must be written in lowercase. 'Print' causes a NameError. It should be 'print("Finished")'.