python编程快速上手 ch5

想象一下，被征服的龙的战利品被表示为这样的字符串：

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

编写一个名为的函数addToInventory(inventory, addedItems)，其中inventory参数是表示玩家的库存的字典（如上一个项目中所示），addedItems参数是一个列表dragonLoot。该addToInventory()函数应该返回一个表示更新的库存的字典。请注意，该addedItems列表可以包含相同项目的倍数。你的代码看起来像这样：

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

#stuff = {'rope': 1, 'torch': 6, 'gold coin': 42, 'dagger': 1, 'arrow': 12}

#displayInventory(stuff)

'''
输出如下：
Inventory:
12 arrow
42 gold coin
1 rope
6 torch
1 dagger
Total number of items: 62
'''

#! /usr/bin/env    python3 


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

def addToInventory(inventory,addedItems):
        for i in addedItems:    
            if i in inventory.keys():
                inventory[i] += 1
            else :
                inventory[i] = 1      
        return inventory


inv = {'gol coin':1,'rope':1}
dragonLoot = ['gold coin','dagger','gold coin','gold coin','ruby']
inv = addToInventory(inv,dragonLoot)
displayInventory(inv)

输出结果如下：

Inventory:
1 ruby
4 gold coin
1 dagger
1 rope
Total number of items:7