如何在Python中使用JSON fi将所有特定元素名添加到列表中

Question

使用python2.7和普通的JSON模块，如何将所有“accountName”变量放在一个列表中？你知道吗

{"accounts":[
    {   "accountName":"US Account", 
        "firstName":"Jackson"
    },
    {   "accountName":"Orange Account", 
        "firstName":"Micheal"
    },
    {   "accountName":"f safasf", 
        "firstName":"Andrew"
    }
]}

我试过：

x = 0
accountsList = []

for Accounts['accountName'] in Accounts['accounts'][x]:
    accountsList.append(accountName)
    print accountsList
    x = x + 1

但我知道这是非常错误的，有什么想法吗？你知道吗

Answer 1

我会使用一个列表，比如：

accountsList = [x["accountName"] for x in Accounts["accounts"]]

列表理解就像一个小的for-循环，它在遍历另一个iterable时生成一个列表。你知道吗

Answer 2

通过列表理解，您可以：

[account["accountName"] for account in Accounts["accounts"]]
Out[13]: ['US Account', 'Orange Account', 'f safasf']

这与您正在执行的操作类似，只是循环是：

accountsList = []
for account in Accounts["accounts"]: #because the "accounts" key gives a list
    accountsList.append(account["accountName"]) #under that list, there are 3 dictionaries and you want the key "accountName" of each dictionary