← Python

For Loops

A for loop iterates over each item in a sequence one at a time

What it does: A for loop repeats a block of code once for each item in a sequence — a list, a string, or a range() of numbers. The loop variable (often i or x) takes each value from the sequence in turn, connected by the keyword in: for i in range(5):. Like an if statement, the line must end with a colon and the repeated code must be indented underneath it.

Common mistakes: Forgetting the trailing colon (for i in [1, 2, 3] instead of for i in [1, 2, 3]:) is the most common slip. It's also easy to forget that range(5) produces 0, 1, 2, 3, 4 — five numbers starting at 0, not 1 through 5.

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Learning

Duo

What does a for loop do?

Loops through each item in a sequenceLoops forever

Matches

❌ for x in range(5) print(x)

↓

Error: Missing colon after for

Applying

Meanings

Term

for

Meaning

Loop that iterates through each item in a sequence.

Practice

for i in [1, 2, 3]:

Testing

Gaps

i in [1, 2, 3]:

Check Answer

Spots

1total = 0

2for i in [1, 2, 3]

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Quick Questions

1. What does a for loop do?

A. Loops through each item in a sequence ✓

B. Loops forever

for visits each item in a list, string, or range — one at a time

2. for x in [10,20,30]:\n print(x)\nWhat prints?

A. 30

B. 10, 20, 30 ✓

The loop visits every item in order — all three values print

3. for char in 'Hi':\n print(char)\nWhat prints?

A. H then i ✓

B. Hi

Looping over a string gives one character per iteration

4. What keyword follows 'for x'?

A. of

B. in ✓

The syntax is: for variable in sequence:

5. How many times does 'for i in range(3):' loop?

A. 3 times ✓

B. 4 times

range(3) produces 0, 1, 2 — three values, three iterations

Match the Pairs

for x in range(5) print(x) → Error: Missing colon after for

for in range(5): print('hi') → Error: Missing loop variable

for char in 'hello': print(char) → Valid: Loop through string

for item in [1, 2, 3]: print(item) → Ok: Loop through list

for i in range(3): print(i) → Output: 0 1 2

total = 0 for n in [1,2,3]: total += n print(total) → Output: 6

Key Term

for

Loop that iterates through each item in a sequence.~~in

Fill in the Blanks

1. for i in [1, 2, 3]: print(i)

2. for i in [1, 2, 3]: print(i)

3. for char in 'hello': print(char)

4. for color in ['red', 'blue']: print(color)

5. for i in range(5): print(i)

Spot the Error

Question 1

A total = 0

B for i in [1, 2, 3]

C total += i

D print(i)

E print('Sum:', total)

Line B — Missing colon at the end of the for line

Question 2

A total = 0

B for i in [1, 2, 3]:

C print(i)

D total += i

E print('Done')

Line C — The print line must be indented inside the for loop

Question 3

A total = 0

B For i in [1, 2, 3]:

C total += i

D print(i)

E print('Sum:', total)

Line B — for must be lowercase: For is not valid Python

Question 4

A total = 0

B for i of [1, 2, 3]:

C total += i

D print(i)

E print('Sum:', total)

Line B — Use 'in', not 'of': Python syntax is: for x in sequence:

Question 5

A total = 0

B for i in 5:

C total += i

D print('Sum:', total)

Line B — Can't loop over a plain number: use range(5) to loop 5 times

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