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Watch your code run line by line, guess what happens next, then write it yourself.

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4 languages · 41 lessons each · free · certificate at the end

1apples = 5
2pears = 3
3apples = apples + pears
4print(apples)
5pears = 10
6print(pears)

int apples

5

Output

(nothing yet)

line 1apples now holds 5.

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Every lesson: watch, guess, write

  1. 1Watch it run

    1apples = 5
    2pears = 3
    3apples = apples + pears
    int apples5int apples8

    See every value change, one line at a time.

  2. 2Guess what it prints

    1x = 4
    2y = x
    3x = 9
    4print(y)

    What does it print? Pick one.

  3. 3Write it yourself

    Make a variable age holding 19. Then print Next year I will be 20, working out the 20 with age + 1.

    1age = 19
    2print("Next year I will be",
    3      age + 1)

    Output

    Next year I will be 20

    Test passed

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23 lessons in Python

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