Python indentation and colons

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Quick Questions

Shade in the A or B circle for each question.

1. Which if statement is written correctly?

A if score > 10

B if score > 10:

2. Which code block is indented correctly?

A if age >= 13: print("Teen")

B if age >= 13: print("Teen")

3. How many spaces are normally used for each level of indent in Python?

A 4 spaces

B 1 space

4. A for loop has 3 lines inside it. How should they be indented?

A All 3 lines use the same amount of indent

B Each line uses a different amount of indent

5. Look at this code: if x > 5: print("Big") print("Done") When does "Done" print?

A Only when x is bigger than 5

B Every time, because it is not indented

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1if score > 10:		AThis line is indented 4 spaces, so it is inside the block above it.
2 print("Hi")		BThe line after the colon is not indented, so it is not inside the block. Indent it by 4 spaces.
3Every line inside a block is indented by the same amount, usually 4 spaces		Cfor i in range(3): print(i) print(i * 2)
4The block ends when the indent ends, so the next unindented line runs after the block		Dwhile x < 3: x = x + 1 print("Done")
5if age >= 13 print("Teen")		EThe if line is missing the colon at the end, so Python does not know a block is starting. Add : after the condition.
6for i in range(3): print(i)		FThe colon at the end of the line starts a block. The indented lines under it belong to the if.

Definitions

Fill in the Blanks

Complete each line of code by filling in the missing parts.

if age >= 13_ print("Teen")

for i in range(3)_ print(i)

_____ count < 3: print(count) count = count + 1

def greet(name)_ print("Hi " + name) greet("Mia")

for i in range(2): print(i) _____("Finished")

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A score = 8

B if score > 5:

C print('Pass')

D else

E print('Try again')

Question 2

A count = 0

B while count < 3:

C count = count + 1:

D print(count)

Question 3

A for i in range(5)

B print(i)

C print('End')

Question 4

A def greet(name):

B print('Hi', name)

C if name == 'Sam'

D print('Hello')

Question 5

A def show_score(score);

B print('Score:', score)

C show_score(10)

Answer Key

Python indentation and colons

Section A: Quick Questions

B — if score > 10:

A — if age >= 13: print("Teen")

A — 4 spaces

A — All 3 lines use the same amount of indent

B — Every time, because it is not indented

Section B: Match the Pairs

if score > 10: → The colon at the end of the line starts a block. The indented lines under it belong to the if.

print("Hi") → This line is indented 4 spaces, so it is inside the block above it.

Every line inside a block is indented by the same amount, usually 4 spaces → for i in range(3): print(i) print(i * 2)

The block ends when the indent ends, so the next unindented line runs after the block → while x < 3: x = x + 1 print("Done")

if age >= 13 print("Teen") → The if line is missing the colon at the end, so Python does not know a block is starting. Add : after the condition.

for i in range(3): print(i) → The line after the colon is not indented, so it is not inside the block. Indent it by 4 spaces.

Section C: Definitions

: — A colon at the end of a line starts a block. The lines inside the block are indented by the same amount (4 spaces), and the block ends when the indent ends.

Section D: Fill in the Blanks

if age >= 13:
    print("Teen")

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

while count < 3:
    print(count)
    count = count + 1

def greet(name):
    print("Hi " + name)
greet("Mia")

for i in range(2):
    print(i)
print("Finished")

Section E: Spot the Error

D — The else line starts a block, so it must end with a colon. It should be 'else:'.

C — Only a line that starts a block ends with a colon. This line is an ordinary instruction inside the loop, so it should have no colon: ' count = count + 1'.

A — A for line starts a block, so it must end with a colon. It should be 'for i in range(5):'.

C — An if line starts a new block, so it must end with a colon. It should be " if name == 'Sam':".

A — A def line must end with a colon, not a semicolon. The colon starts the function block. It should be 'def show_score(score):'.