Question

我创建了一个用于解析json API的python应用程序有3个端点，其中1个让我担心。
端点是：http://coinmarketcap.northpole.ro/history.json?coin=PCN

我的代码：

#!/bin/bash
cd /home
touch somefile
/usr/bin/expect<<FILETRANSFER
spawn scp -r -P remoteServerPort somefile remoteServerIP:/home
expect "assword:"
send "MyPassWord\r"
interact
FILETRANSFER
echo "It's done"

当我试图获得def getHistory(self, coin): endpoint = "history.json?year=2017&coin=PCN" data = urllib2.urlopen(self.url + endpoint).read() data = json.loads(data)['history'] return data def getOrder(self): for c in self.getCoinsList(): res = [] symbol = c['symbol'] price = self.getCoinPrice(symbol) count = 0 count_days = len(self.getHistory(symbol)) for h in self.getHistory(symbol): if h['price']['usd'] > price: ++count percent_down = count_days / count * 100 line = {'symbol': symbol, 'price': price, 'percent_down': percent_down} res.append(line) return res时，我有这个：

h['price']['usd']

当我File "coinmarketcap.py", line 39, in getOrder if h['price']['usd'] > price: TypeError: string indices must be integers时，它会返回unicode。

Answer 1

getHistory返回一个字典，当你像这样迭代它时：

for h in self.getHistory(symbol):

你正在迭代dict 键，而不是值。

要迭代该值，请使用

for h in self.getHistory(symbol).values(): # .itervalues() in python2

Answer 2

@Pixel，我认为你假设for h in self.getHistory(symbol):返回密钥的值，这是不正确的，它会返回密钥。

尝试保存字典并按键映射获取，如下所示，

json_data = self.getHistory(symbol)
for h in json_data:
    if json_data[h]['price']['usd'] > price:
        ++count

或使用

从字典值中检索值

for h in self.getHistory(symbol).values():
    if h['price']['usd'] > price:
        ++count

解析Json时出错

2 个答案: