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diff --git a/py03/ex4/ft_inventory_system.py b/py03/ex4/ft_inventory_system.py
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+#!/usr/bin/env python3
+# https://www.freecodecamp.org/learn/python-v9/review-dictionaries-and-sets/review-dictionaries-and-sets
+
+import sys
+
+
+def ft():
+    print("=== Inventory System Analysis ===")
+    # check for when there are no params given
+    if len(sys.argv) < 2:
+        print("Enter items following this format: <item_name>:<quantity>")
+        return
+    # initialize dictionary
+    inventory = {}
+    # init list to check for duplicates
+    seen = []
+    for arg in sys.argv[1:]:
+        try:
+            item, quantity = arg.split(':')
+            # print redundant item.s
+            if item in seen:
+                print(f"Redundant item '{item}' - discaring")
+            else:
+                seen.append(item)
+            try:
+                # check that quantities are int
+                int(quantity)
+                if int(quantity) < 0:
+                    raise ValueError("quantity cannot be negative")
+            except ValueError as err:
+                print(f"Quantity error for '{item}': {err}")
+            else:
+                # populate dict
+                inventory[item] = quantity
+        except ValueError:
+            print(f"Error - invalid parameter '{arg.rstrip()}'")
+            if arg == sys.argv[-1] and arg == sys.argv[1]:
+                return
+    # check for when there are many invalid param and no valid params
+    if not seen:
+        return
+    if not inventory:
+        return
+    print(f"Got inventory: {inventory}")
+    item_list = []
+    for item in inventory.keys():
+        item_list.append(item)
+    print(f"Item list: {item_list}")
+    total_quantity = 0
+    for quantity in inventory.values():
+        total_quantity += int(quantity)
+    print(f"Total quantity for the "
+          f"{len(inventory.values())} items: {total_quantity}")
+    # compute percentages
+    for key in inventory:
+        per_of_total = round(100 * (int(inventory[key]) / total_quantity), 1)
+        print(f"Item {key} represents {per_of_total}%")
+    # look for item with max quantity
+    max_value = 0
+    max_key = item_list[0]
+    for key in inventory:
+        if max_value == 0:
+            max_value = int(inventory[key])
+        if int(inventory[key]) > max_value:
+            max_value = int(inventory[key])
+            max_key = key
+    print(f"Item most abundant: {max_key} with quantity {max_value}")
+    # look for item with min quantity
+    min_value = 0
+    min_key = item_list[0]
+    for key in inventory:
+        if min_value == 0:
+            min_value = int(inventory[key])
+        if int(inventory[key]) < min_value:
+            min_value = int(inventory[key])
+            min_key = key
+    print(f"Item least abundant: {min_key} with quantity {min_value}")
+    inventory.update({'magic item': '1'})
+    print(inventory)
+
+
+if __name__ == "__main__":
+    ft()