我必须使用返回 json 对象的 YQL 从雅虎 requests.get() 获取两个网址。我正在获取存储到 list() 中的 json 对象。然后我循环解析数据并创建一个 dic，然后创建一个 pandas 数据框。碰巧只有一个列表被附加到数据框中。似乎在最后一次迭代中，第二个列表覆盖了第一个列表。此时，我不知道如何在列表上迭代 append() 列表的两个元素。这是我的代码...
import requests
import pandas as pd
urls = ['https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.historicaldata%20where%20symbol%20in%20(%22DIA%22%2C%22SPY%22%2C%22IWN%22)%20and%20startDate%20%3D%20%222015-01-01%22%20and%20endDate%20%3D%20%222015-10-31%22&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=',
'https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.historicaldata%20where%20symbol%20in%20(%22DIA%22%2C%22SPY%22%2C%22IWN%22)%20and%20startDate%20%3D%20%222015-11-01%22%20and%20endDate%20%3D%20%222016-08-31%22&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=']
for url in urls:
data = requests.get(url)
data_json = data.json()
quote_list = []
for quote in data_json['query']['results']['quote']:
quote_dic = {'symbol': quote['Symbol'],
'date': quote['Date'],
'volume': quote['Volume'],
'low': quote['Low'],
'high': quote['High'],
'open': quote['Open'],
'close': quote['Close'],
'adj_close': quote['Adj_Close']}
quote_list.append(quote_dic)
quote_df = pd.DataFrame(quote_list)
quote_df.to_csv('stocks.csv')
我需要能够将整个 list() 附加到数据框中。这段代码的修复方法是什么？
最佳答案
只需创建一个数据帧列表，并将它们连接到循环末尾:
df_list = []
for url in urls:
data = requests.get(url)
data_json = data.json()
df = pd.DataFrame(data_json['query']['results']['quote'])
df_list.append(df)
quote_df = pd.concat(df_list)
quote_df.to_csv('stocks.csv')
关于python-3.x - 循环将多个列表附加到数据帧python中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40496008/