IndentationError and missing colons

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which line of code is correct Python?

A if score > 10:

B if score > 10

2. Python says 'IndentationError: expected an indented block'. What is the most likely cause?

A The line after the colon is not indented

B The variable name is spelled wrong

3. Which for loop is written correctly?

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

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

4. Which def line has the correct syntax?

A def greet()

B def greet():

5. A line in the middle of your program has extra spaces at the start, but it is not after a colon. What error will Python show?

A IndentationError: unexpected indent

B IndentationError: expected an indented block

Match the Pairs

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

Left column		Right column
1if age >= 13: print('Teen')		ASyntaxError: expected ':'. The for line is missing the colon that opens the loop block.
2for i in range(3) print(i)		BUnexpected indent: print(x) is indented even though no block was opened above it. Remove the extra spaces so the line lines up with x = 5.
3Every line inside a block must be indented by the same amount so Python knows they belong together		Cdef greet(): print('Hi')
4A def line must end with a colon, followed by an indented body		DIndentationError: expected an indented block. The line after the colon is not indented, so Python can't tell it belongs inside the if.
5x = 5 print(x)		EMixing spaces and a tab: the last line is indented with a tab while the one above uses spaces. Use the same 4 spaces on both lines.
6if score > 5: print('Win') print('Done')		Fwhile lives > 0: print(lives) lives -= 1

Definitions

IndentationError

Fill in the Blanks

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

age = 14 if age >= 13_ print("Teen")

names = ["Ava", "Liam"] ___ name in names: print(name)

count = 0 while count < 3: ____print(count)

___ show_score(score): print(score) show_score(10)

lives = 3 while lives > 0_ lives = lives - 1

Spot the Error

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

Question 1

A score = 10

B if score > 5

C print("Pass")

Question 2

A age = 12

B print(age)

C if age < 13

D print("Kid")

Question 3

A total = 0

B for n in range(3)

C total += n

Question 4

A a = 1

B b = 5

C while a < b;

D a += 1

Question 5

A n = 7

B if n > 5;

C print("Big")

Answer Key

IndentationError and missing colons

Section A: Quick Questions

A — if score > 10:

A — The line after the colon is not indented

B — for i in range(3): print(i)

B — def greet():

A — IndentationError: unexpected indent

Section B: Match the Pairs

if age >= 13: print('Teen') → IndentationError: expected an indented block. The line after the colon is not indented, so Python can't tell it belongs inside the if.

for i in range(3) print(i) → SyntaxError: expected ':'. The for line is missing the colon that opens the loop block.

Every line inside a block must be indented by the same amount so Python knows they belong together → while lives > 0: print(lives) lives -= 1

A def line must end with a colon, followed by an indented body → def greet(): print('Hi')

x = 5 print(x) → Unexpected indent: print(x) is indented even though no block was opened above it. Remove the extra spaces so the line lines up with x = 5.

if score > 5: print('Win') print('Done') → Mixing spaces and a tab: the last line is indented with a tab while the one above uses spaces. Use the same 4 spaces on both lines.

Section C: Definitions

IndentationError — Python errors when a block's lines are not indented consistently, or when the if, for, while or def line that opens the block is missing its colon.

Section D: Fill in the Blanks

age = 14
if age >= 13:
    print("Teen")

names = ["Ava", "Liam"]
for name in names:
    print(name)

count = 0
while count < 3:
    print(count)

def show_score(score):
    print(score)
show_score(10)

lives = 3
while lives > 0:
    lives = lives - 1

Section E: Spot the Error

B — The if line opens a block, so it must end with a colon. Without it Python raises a syntax error. It should be: if score > 5:

C — The if line opens a block but has no colon, so the indented line below it has nothing to belong to. It should be: if age < 13:

B — The for line opens the loop block, so it needs a colon at the end. It should be: for n in range(3):

C — A semicolon was typed instead of a colon. The while line must end with a colon to open its indented block. It should be: while a < b:

B — The if line ends with a semicolon, but Python needs a colon to open the indented block. It should be: if n > 5: