range

Learn number sequences with range().

The range function

range generates a number range. range(5) generates 0 through 4:

for i in range(5):
    print(i)  # 0 1 2 3 4

range(2, 6) gives 2 through 5. range(0, 10, 2) gives 0 to 9 in steps of 2 (0, 2, 4, 6, 8). range is not a list but a range object; to convert use list(range(5)).

The range step parameter

range can take three parameters: range(start, stop, step):

for i in range(0, 10, 2):
    print(i)  # 0 2 4 6 8

for i in range(10, 0, -1):
    print(i)  # 10 9 8 ... 1

A negative step counts backwards. This is handy for countdowns and skipping loops.

Exercise Print with range

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

Show example solution

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

Test yourself

What numbers does range(3) produce?
- 1, 2, 3
- 0, 1, 2
- 0, 1, 2, 3
- 3
Show answer

0, 1, 2 — range(3) produces 0, 1, 2.

Complete range

for i in ____(5):
    print(i)

Show answer

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

Match the range forms

range(5)

0-4
range(2, 6)

2-5
range(0, 10, 2)

0,2,4,6,8
range(10, 0, -1)

10 down to 1

Next lesson: The while loop

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