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diff --git a/py02/ex4/ft_finally_block.py b/py02/ex4/ft_finally_block.py
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+#!/usr/bin/env python3
+
+class GardenError(Exception):
+    def __init__(self, message="Unknown plant error"):
+        self.message = message
+        # Why self.message; why not just 'message'
+        super().__init__(self.message)
+
+
+class PlantError(GardenError):
+    pass
+
+
+class WaterError(GardenError):
+    pass
+
+
+def water_plant(plant):
+    if plant == plant.capitalize():
+        print(f"Watering {plant}: [OK]")
+    else:
+        raise PlantError(f"Invalid plant name to water: '{plant}'")
+
+
+def test_watering_system(plants):
+    print("Open watering system")
+    try:
+        for plant in plants:
+            water_plant(plant)
+    except PlantError as err:
+        print("Caught PlantError:", err)
+        print("...ending tests and returning to main")
+    finally:
+        print("Closing watering system")
+
+
+if __name__ == "__main__":
+    print("=== Garden Watering System ===")
+    print()
+    print("Testing valid plants...")
+    test_watering_system(["Tomato", "Lettuce", "Carrots"])
+    print()
+    print("Testing invalid plants...")
+    test_watering_system(["Tomato", "lettuce", "Carrots"])
+    print()
+    print("Cleanup always happens, even with errors!")