Question

我正在从YAHOO抓取数据，并尝试使用另一个文件上的值从其数据框中提取某个值。

我设法抓取数据并将其显示为数据框。事情是我试图使用另一个df从数据中提取某个值。

这是我得到的CSV

df_earnings=pd.read_excel(r"C:Earnings to Update.xlsx",index_col=2)
stock_symbols = df_earnings.index

输出：

             Date        E Time           Company Name
Stock Symbol                                                
CALM         2019-04-01  Before The Open     Cal-Maine Foods
CTRA         2019-04-01  Before The Open      Contura Energy
NVGS         2019-04-01  Before The Open  Navigator Holdings
ANGO         2019-04-02  Before The Open       AngioDynamics
LW           2019-04-02  Before The Open         Lamb Weston`

然后我使用Yahoo Finance的数据下载每只股票的csv：

driver.get(f'https://finance.yahoo.com/quote/{stock_symbol}/history?period1=0&period2=2597263000&interval=1d&filter=history&frequency=1d')

输出：

            Open     High     Low        ...       Adj Close Volume  Stock Name
Date                                     ...                                    
1996-12-12  1.81250  1.8125  1.68750     ...       0.743409  1984400        CALM
1996-12-13  1.71875  1.8125  1.65625     ...       0.777510   996800        CALM
1996-12-16  1.81250  1.8125  1.71875     ...       0.750229   122000        CALM
1996-12-17  1.75000  1.8125  1.75000     ...       0.774094   239200        CALM
1996-12-18  1.81250  1.8125  1.75000     ...       0.791151   216400        CALM

我的问题在这里，我不知道如何从数据框找到日期并将其从下载的文件中提取出来。

现在我不想插入这样的手动日期：

df = pd.DataFrame.from_csv(file_path)
df['Stock Name'] = stock_symbol
print(df.head())

df = df.reset_index()
print(df.loc[df['Date'] == '2019-04-01'])

输出：

     Date        Open       High   ...  Adj Close  Volume  Stock Name
5610 2019-04-01  46.700001  47.0   ...  42.987827  846900  CALM

我想要一个条件，该条件将为每只股票运行我的数据框并提取所需日期

print(df.loc[df['Date'] == the date that is next to the symbol that i just downloaded the file for])

Answer 1

我想您可以使用一个变量来保存日期。

for sy in stock_symbols:
    # The value from the 'Date' column in df_earnings
    dt = df_earnings.loc[df_earnings.index == sy, 'Date'][sy]

    # From the second block of your code relating to 'manual' date
    df = pd.DataFrame.from_csv(file_path)
    df['Stock Name'] = sy
    df = df.reset_index()
    print(df.loc[df['Date'] == dt])

如何从数据帧中提取某个值？

1 个答案: