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Going in order helps, but nothing is locked.

1. 1 · repetition

   Loop Rover

   A rover follows your Python commands: move(), turn_left() and turn_right(). Typing move() ten times works, but a for loop says it once. In this unit you read loops, fix them and write your own, first with the rover and then without it.

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2. 2 · decisions

   Sensor Rover

   Programs can decide. A comparison like score >= 5 is either True or False, and if runs a block only when it is True. The rover now has two sensors, front_is_clear() and at_flag(), so one program can handle grids it has never seen.

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3. 3 · collections

   Lists & Words

   A list keeps many values in order, a string is a list of characters, and a dict looks values up by name. The same for loop works on all of them: for item in my_list visits each item in turn.

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4. 4 · functions

   Function Forge

   A function is a named piece of code you can use again. Parameters are its inputs and return hands back its answer. Good names turn a long program into a few readable steps.

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