← Python

range()

range() generates a sequence of integers, most often used with a for loop

What it does: range(start, stop, step) — starts at 2, counts by 2, stops before 8. Step of 2, stopping before 10 — so 10 is excluded. Stop is 0, which is excluded — count down stops at 1. range(1, 4) gives 1, 2, 3 — that's 3 numbers. Start at 1, add 3 each time: 1, 4, 7, then 10 is excluded. range() only accepts integer arguments. Using floats causes a TypeError. list() converts a range to a list. range(3) gives 0, 1, 2. Creates numbers from 0 up to but not including stop.

Common mistakes: range(1, 5) stops before 5: use range(1, 6) to include 5. To count down, you need a negative step: range(10, 0, -1).

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Learning

Duo

What does range(5) produce?

0, 1, 2, 3, 41, 2, 3, 4, 5

Matches

❌ range(1.5, 10)

↓

Error: range() needs integers

Applying

Meanings

Term

range(stop)

Meaning

Creates numbers from 0 up to but not including stop.

Practice

for i in range(5):

Testing

Gaps

for i in (5):

Check Answer

Spots

2total = 0

3for i in range(1, 5):

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Quick Questions

1. What does range(5) produce?

A. 0, 1, 2, 3, 4 ✓

B. 1, 2, 3, 4, 5

range() starts at 0 by default and stops before the number given

2. What does range(2, 5) produce?

A. 2, 3, 4, 5

B. 2, 3, 4 ✓

range(start, stop) — the stop value is excluded

3. Is the stop value included in range()?

A. No it stops before it ✓

B. Yes always included

range(2, 5) gives 2, 3, 4 — it stops BEFORE 5

4. What does range(0, 10, 2) produce?

A. 0, 2, 4, 6, 8, 10

B. 0, 2, 4, 6, 8 ✓

Step of 2, stopping before 10 — so 10 is excluded

5. What does range(3, 0, -1) produce?

A. 3, 2, 1 ✓

B. 3, 2, 1, 0

Stop is 0, which is excluded — count down stops at 1

Match the Pairs

range(1.5, 10) → Error: range() needs integers

for i in range(5, 1): print(i) → Error: No output — step needed

range(2, 8, 2) → Valid: 2, 4, 6

range(5, 0, -1) → Ok: Counts down 5,4,3,2,1

print(list(range(3))) → Output: [0, 1, 2]

print(list(range(1,6))) → Output: [1, 2, 3, 4, 5]

Key Term

range(stop)

Creates numbers from 0 up to but not including stop.~~range(start, stop)

Fill in the Blanks

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

2. for i in range(1, 6): print(i) # prints 1,2,3,4,5

3. for i in range(0, 10, 2): print(i) # counts by 2

4. for i in range(5, 0, -1): print(i) # counts down

5. for i in range(1, 6): print(i) # starts at 1

Spot the Error

Question 1

A # Print numbers 1 to 5

B total = 0

C for i in range(1, 5):

D print(i)

E total += i

Line C — range(1, 5) stops before 5: use range(1, 6) to include 5

Question 2

A # Count down from 10 to 1

B for i in range(10, 0):

C print(i)

D print('Done!')

Line B — To count down, you need a negative step: range(10, 0, -1)

Question 3

A # Print integers 1 to 4

B for i in range(1.0, 5.0):

C print(i)

D print('Done!')

Line B — range() only works with integers: not floats like 1.0

Question 4

A total = 0

B for i in Range(5):

C total += i

D print('Sum:', total)

Line B — range is lowercase: Range is not a valid function

Question 5

A total = 0

B for i in range[5]:

C total += i

D print('Sum:', total)

Line B — range uses parentheses (), not square brackets []

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