Scratch repeat block as a for loop

Python's version of the Scratch repeat 10 block. The lines indented under it run 10 times, and i counts from 0 to 9.

Part of: ACARA Digital Technologies Years 7–8 — Programming with Control Structures and Functions (Python) — Module 34

Understanding Scratch repeat block as a for loop in ACARA Digital Technologies Years 7–8

What it does: The number in repeat 4 goes inside range(4), and the block inside the repeat becomes a line indented under the for line. Python uses indentation, usually 4 spaces, to show which lines belong to the loop. The line must end with a colon. Without it Python gives a SyntaxError. Counting starts at 0, so i goes up to 9. The loop still runs 10 times. i counts from 0 to 9, which is 10 values, so the print line runs 10 times.

Common mistakes: The string is missing its closing quote. The line inside the loop should be ' print("Step")'. The for line must end with a colon. It should be 'for i in range(10):'.

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This module's key terms are also in a printable crossword (Modules 482–519) and word search (Modules 420–519).

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Learning

Duo

Which Python code does the same job as the Scratch block 'repeat 10'?

repeat 10:for i in range(10):

Matches

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):

Applying

Meanings

Term

for i in range(10):

Meaning

Python's version of the Scratch repeat 10 block. The lines indented under it run 10 times, and i counts from 0 to 9.

Practice

for i in range(10):

Testing

Gaps

for i in (10):

Check Answer

Spots

2for i in range(10):

3 print("Step)

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Quick Questions

1. Which Python code does the same job as the Scratch block 'repeat 10'?

A. for i in range(10): ✓

B. repeat 10:

Python has no repeat keyword. A for loop with range(10) runs the lines under it 10 times.

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?

A. They are indented underneath the for line ✓

B. They are wrapped in curly brackets { }

Python uses indentation, usually 4 spaces, to show which lines belong to the loop.

3. Which for loop line has the correct syntax?

A. for i in range(10)

B. for i in range(10): ✓

The line must end with a colon. Without it Python gives a SyntaxError.

4. What values does i take in for i in range(10):?

A. 1, 2, 3, ... 10

B. 0, 1, 2, ... 9 ✓

Counting starts at 0, so i goes up to 9. The loop still runs 10 times.

5. How many times does this code print Hi? for i in range(10): print('Hi')

A. 10 times ✓

B. 9 times

i counts from 0 to 9, which is 10 values, so the print line runs 10 times.

Match the Pairs

for i in range(10): → Python's version of the Scratch repeat 10 block: it repeats the indented lines 10 times

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

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")

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")

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):

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.

Key Term

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.

Fill in the Blanks

1. for i in range(10): print("Jump")

Hint: Type the built-in function name that makes the sequence of numbers to loop over.

2. # Scratch: repeat 10 for i in range(10): print("Clap")

Hint: Type the number of repeats that matches the Scratch repeat block in the comment.

3. for i in range(5): print("Step")

Hint: Type the keyword that starts a Python loop which repeats a set number of times.

4. for i in range(3): print(i)

Hint: Type the loop variable name that holds the current count.

5. for i in range(3): print(i + 1)

Hint: Counting starts at 0, so type the number to add to show the count starting from one.

Spot the Error

Question 1

A print("Start")

B for i in range(10):

C print("Step)

Line C — The string is missing its closing quote. The line inside the loop should be ' print("Step")'.

Question 2

A count = 0

B for i in range(10)

C count = count + 1

Line B — The for line must end with a colon. It should be 'for i in range(10):'.

Question 3

A for i in range[10]:

B print("Jump")

C print("Done")

Line A — range uses round brackets, not square brackets. It should be 'for i in range(10):'.

Question 4

A print("Dance time")

B For i in range(10):

C print("Spin")

Line B — Python is case sensitive, so 'for' must be lowercase. It should be 'for i in range(10):'.

Question 5

A for i in range(10):

B print("Move")

C print("Turn")

D Print("Finished")

Line D — print must be written in lowercase. 'Print' causes a NameError. It should be 'print("Finished")'.

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