Question

从网站抓取的数据：

 {'data': {'id': 1, 'name': 'Bitcoin', 'symbol': 'BTC', 'website_slug': 'bitcoin', 'rank': 1, 'circulating_supply': 17290912.0, 'total_supply': 17290912.0, 'max_supply': 21000000.0, 'quotes': {'USD': {'price': 6468.27571485, 'volume_24h': 4319636048.09599, 'market_cap': 111842386177.0, 'percent_change_1h': -0.31, 'percent_change_24h': 0.01, 'percent_change_7d': 0.76}}, 'last_updated': 1538037891}, 'metadata': {'timestamp': 1538037295, 'error': None}}

我无法访问price变量，因为它嵌套在列表中。有没有办法在python中做到这一点？

我尝试过：

databs.append(data.get('USD', {}).get('price'))

但这返回None

完整代码：

c_list = ["1","52", "1958","1042"]

databs = []

def get_values():
    t1 = time.time()
    for i in c_list:
        with urllib.request.urlopen("https://....") as url:
            data = json.loads(url.read().decode())
            #print(data) # This prints the list and i see the values are present
            databs.append(data.get('USD', {}).get('price'))
    a_current =databs[0]
    b_current =databs[1]
    c_current =databs[2]
    d_current =databs[3]
    print(databs)

while True:
    get_values()

返回[None, None, None, None]

Answer 1

要访问嵌套字典，您可以尝试执行以下操作：

def getDictValue(dic, key):
    for item in key.split('.'):
        if item in dic:
            dic = dic[item]
        else:
            return None
    return dic

要访问price，例如：price = getDictValue(data, 'data.quotes.USD.price')

使用urllib将数据附加到网络抓取的JSON列表中

1 个答案: