meng.addToInventory.py

# addToInventory.py
# written by yuxin.meng on Dec 30th in 2017.
# e-mail: mengyuxin@hotmail.com

def addToInventory(inventory, addedItems):
    # your code goes here
    for i in range(len(addedItems)):
        k = addedItems[i]
        inventory.setdefault(k, 0)
        inventory[k] += 1
    return inventory

def displayInventory(inventory):
    print('Inventory:')
    item_total = 0
    for k, v in inventory.items():
        print(str(v) + ' ' + k)
        item_total += v
    print('Total number of items: ' + str(item_total))

inv = {'gold coin': 42,
       'rope': 1}

dragonLoot = ['gold coin',
              'dagger',
              'gold coin',
              'gold coin',
              'ruby']

inv = addToInventory(inv, dragonLoot)
displayInventory(inv)