⏭️ Section 13: Time Passing (Tick System)

📝 Summary (What you will do)

In this section, you will add a time‑passing helper that advances every pet in the game. You will:

Create a tick_all() function that loops over all pets
Call each pet’s tick() method so stats decay automatically

This keeps the game moving forward after every turn.

✅ Checklist (You must complete these)

Open pet_manager.py
Find the end of the flow functions (adopt_flow and care_flow)
Directly below them, add the tick_all() function
Type the code by hand so you understand how the loop works

✅ No new constants/settings are added in this section, so you do not need to edit the top-of-file constants.

🎓 Core Concepts (New learning for this section)

1) Looping over a list of objects

player.animals is a list of Animal objects.
A for loop lets us run the same action on each pet:

First pet gets a tick
Second pet gets a tick
Every pet advances time

2) Calling a method on each object

Each pet handles its own tick logic.
The loop doesn’t need to know the details — it just calls:

pet.tick()

That is object‑oriented design in action.

💻 Code to Write (Type this by hand in `pet_manager.py`)

Directions:

Open pet_manager.py
Find the end of the flow functions (adopt_flow, care_flow)
Directly below them, type the following code by hand:

🧠 Code Review & Key Concepts (What important lines do)

The loop

for pet in player.animals:

This goes through each pet the player owns, one by one.

Calling `tick()`

pet.tick()

Each pet updates its own hunger, happiness, cleanliness, and XP.

🧪 Test File: `s13_test.py`

✅ Create this file

Create a new file in the same folder as pet_manager.py called:

s13_test.py

💻 Code to write in `s13_test.py`

🧠 What this test is doing (and how it works)

We create a Player with two pets
We print hunger before the tick
We call tick_all() to advance time
We print hunger again and expect it to increase

✅ Run the test:

python s13_test.py

If the hunger numbers go up, your tick system is working.