Nested For Loops

So far, you have used loops to repeat small action patterns — not just single commands, but short sequences of movements and actions.

But sometimes, that pattern needs to be repeated again. This is where nested loops become useful.

A nested loop is simply a loop inside another loop:

• The inner loop describes a repeating pattern;
• The outer loop controls how many times that whole pattern runs.

You can think of it like this: "Repeat this sequence… and do that multiple times".

Repeating Patterns on a Grid

Imagine a map where the Ninja must perform:

1. The same movement-and-collection pattern;
2. Shift position;
3. Repeat that same pattern again.

Writing this without nested loops would mean copying a lot of code. Nested loops let you describe this structure clearly and compactly.

Outer loop

for i in range(4):

This loop controls how many times the overall pattern repeats. Each iteration represents one full pass of the same strategy.

Inner loop

for j in range(3):
    ninja.go_right()
    ninja.pick_sushi()

This loop defines the repeated action pattern: move and collect sushi.

Moving to the next area

ninja.go_left()
ninja.go_left()
ninja.go_down()

After completing the inner loop, the Ninja shifts position and prepares to repeat it again.