在python中添加数据到字典 [英] Add data to dictionary in python

问题描述

这是我的字典：

  inventory = {
'gold'：500，
' pouch'：['flint'，'twine'，'gemstone']，＃分配一个新的列表pouch键
'背包'：['xylophone'，'dagger'，'bedroll'，'bread loaf'] 
} 
  

我需要添加50到$ code>金。
我该怎么办？我试过：

 库存['gold']。append（50）
  / pre> 
 
解决方案
  gold 不是列表。这是一个整数，所以你使用添加：
  'gold'] + = 50 
  
这使用扩充赋值，其中的整数相当于： p> 
 
 
 库存['gold'] =库存['gold'] + 50 
  pre> 
 
 
如果您需要 gold 作为列表，并希望最终获得 [500，50] 作为价值，您必须使用列表将替换当前值：
  inventory ['gold'] = [inventory ['gold']，50] 
  
如果您需要随时间添加多个值，并且不知道 gold 是一个列表还是一个简单的整数，而不能将原始字典更改为始终使用列表，您可以使用异常处理：
  try：
 inventory ['gold']。append（50）
除了AttributeError：
＃不是一个列表
库存['g old'] = [inventory ['gold']，50] 
  
这将更容易维护您的项目，如果您开始  gold 始终是列表对象。
 
Here is my dictionary:
inventory = {
    'gold' : 500,
    'pouch' : ['flint', 'twine', 'gemstone'], # Assigned a new list to 'pouch' key
    'backpack' : ['xylophone','dagger', 'bedroll','bread loaf']
}
I need to add 50 to the index of gold. 
What should I do? I tried:
inventory['gold'].append(50)

解决方案
gold is not a list. It is an integer, so you use addition:
inventory['gold'] += 50
This uses augmented assignment, which for integers is equivalent to:
inventory['gold'] = inventory['gold'] + 50
If you need gold to be a list as well, and want to end up with [500, 50] as the value, you'll have to replace the current value with a list:
inventory['gold'] = [inventory['gold'], 50]
If you need to add multiple values over time, and don't know if gold is a list or a simple integer, and cannot change the original dictionary to always use a list, you could use exception handling:
try:
    inventory['gold'].append(50)
except AttributeError:
    # not a list yet
    inventory['gold'] = [inventory['gold'], 50]
It would be far easier to maintain your project if you started with gold always being a list object, however.

                        
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