#! /usr/bin/env python3

def displayInventory(inventory):
    print("Inventory:")
    output = ""
    item_total = 0
    for k,v in inventory.items():
        output += str(v)+" "+k+"\n"
        item_total+= v
    output += "Total number of items: "+str(item_total)
    return output

def addToInventory(inventory, addedItems): #modifies in place!
    for i in addedItems:
        inventory.setdefault(i, 0)
        inventory[i] += 1

inventory = {'rope': 1, 'torch': 6, 'gold coin': 42, 'dagger': 1, 'arrow': 12}
dragonLoot = ['gold coin', 'dagger', 'gold coin', 'gold coin', 'ruby']
print(displayInventory(inventory))
addToInventory(inventory, dragonLoot)
print(displayInventory(inventory))