save persistent inventory

persistent_auditor.py

@@ -0,0 +1,84 @@
+def get_valid_input():
+    global failed_attempts
+
+    while True:
+        user_input = input("Enter stock quantity: ").strip()
+
+        if user_input.lower() == "quit":
+            return "quit"
+
+        if not user_input.isdigit():
+            print("Error: Invalid input. Please enter a non-negative integer.\n")
+            failed_attempts += 1
+            continue
+
+        quantity = int(user_input)
+
+        if quantity < 0:
+            print("Error: Negative numbers are not allowed.\n")
+            failed_attempts += 1
+            continue
+
+        return quantity
+
+
+def process_delivery(current_total, new_value):
+    return current_total + new_value
+
+
+def calculate_tax(amount):
+    return amount * 0.10
+
+
+def generate_report(total_units, failed_attempts):
+    print("\n--- Audit Report ---")
+    print(f"Total Units Processed: {total_units}")
+    print(f"Failed/Rejected Entries: {failed_attempts}")
+
+
+def load_inventory():
+    try:
+        with open("inventory.txt", "r") as inventory_file:
+            inventory = int(inventory_file.readline().strip())
+            history_line = inventory_file.readline().strip()
+            history = [] if not history_line else [int(value) for value in history_line.split(",")]
+            return inventory, history
+    except FileNotFoundError:
+        return 0, []
+
+
+def save_inventory(inventory, transaction_history):
+    with open("inventory.txt", "w") as inventory_file:
+        inventory_file.write(f"{inventory}\n")
+        inventory_file.write(",".join(str(quantity) for quantity in transaction_history))
+        inventory_file.write("\n")
+
+
+inventory, transaction_history = load_inventory()
+total_units = 0
+failed_attempts = 0
+
+print("=== Stock Auditor ===")
+print("Type 'quit' to exit.\n")
+
+while True:
+    quantity = get_valid_input()
+
+    if quantity == "quit":
+        save_inventory(inventory, transaction_history)
+        break
+
+    tax = calculate_tax(quantity)
+
+    transaction_history.append(quantity)
+    inventory = process_delivery(inventory, quantity)
+    total_units = process_delivery(total_units, quantity)
+
+    print(f"Stock added. Current inventory: {inventory}")
+    print(f"Tax on this delivery: ${tax:.2f}\n")
+
+    if inventory > 500:
+        print(f"ALERT: Overstock detected! Inventory ({inventory}) exceeds 500 units.")
+        break
+
+generate_report(total_units, failed_attempts)