Alpha Vantage for loop TypeError: string indices must be integers

Question

我一直在尝试让 for each 循环遍历数据并输出特定日期（如 2020-04-03）的键和值。但我不断收到以下错误：TypeError: string indices must be integers

我的代码：

import time
from alpha_vantage.timeseries import TimeSeries
import json

key = 'Your key here'
ts = TimeSeries(key)
ko, meta = ts.get_daily(symbol='KO')

ko_info = json.dumps(ko, indent = 2, sort_keys = True)

data = json.loads(ko_info)

print(data)
print(type(data))

ko_org = json.dumps(data, indent = 2, sort_keys = True)
print(ko_org)
print(type(ko_org))

for x in ko_org['2020-04-01']:
    print(x['1. open'])

数据：

{
  "2019-11-11": {
    "1. open": "52.3300",
    "2. high": "52.3700",
    "3. low": "51.7750",
    "4. close": "51.8400",
    "5. volume": "8198125"
  },
  "2019-11-12": {
    "1. open": "51.9100",
    "2. high": "51.9100",
    "3. low": "51.5831",
    "4. close": "51.7100",
    "5. volume": "12656881"
  },
  "2019-11-13": {
    "1. open": "52.1800",
    "2. high": "52.4500",.....

Answer 1

几件事：

pythonAlpha Vantage wrapperreturnsjson中的数据，所以不需要做：

ko_info = json.dumps(ko, indent = 2, sort_keys = True)

data = json.loads(ko_info)

print(data)
print(type(data))

ko_org = json.dumps(data, indent = 2, sort_keys = True)
print(ko_org)
print(type(ko_org))

因为它是多余的，所以我们可以废弃所有这些。

正如@Psidom 所说，您不能像那样循环遍历 json.dumps 的字符串，但是我们可以循环遍历从常规返回数据中获得的 dict/json，例如：

for x in ko:
    if x == '2020-04-01':
        print(ko[x])

这表示 "for every date x in all the data returned, if date x is '2020-04-01' print the quote from that date"

我们把它们放在一起得到：

import time
from alpha_vantage.timeseries import TimeSeries

key = 'Your key here'
ts = TimeSeries(key)
ko, meta = ts.get_daily(symbol='KO')

for x in ko:
    if x == '2020-04-01':
        print(ko[x])

Alpha Vantage for loop TypeError: string indices must be integers

Alpha Vantage for loop TypeError: string indices must be integers

python

json

stockquotes

alpha-vantage