[英]I can load multiple stock tickers from yahoo finance, but I am having trouble adding new columns before it is saved to a csv
下面的代碼首先在 pnls 中上傳來自雅虎財經的數據。 它成功地做到了這一點。 然后我有代碼,我想在 pnls 中向加載的數據添加列。 這部分不成功。 最后,我想將 pnls 保存到一個 csv 文件,如果列更改不在代碼中,它會成功執行。
我需要回答的問題是如何在將 pnls 保存到 csv 之前成功進行多列更改?
from pandas_datareader import data as dreader
import pandas as pd
from datetime import datetime
import numpy as np
# Symbols is a list of all the ticker symbols that I am downloading from yahoo finance
symbols = ['tvix','pall','pplt','sivr','jju','nib','jo','jjc','bal','jjg','ld','cdw','gaz','jjn','pgm',
'sgg','jjt','grn','oil','gld','corn','soyb','weat','uhn','uga','bunl','jgbl','bndx','aunz',
'cemb','emhy','vwob','ald','udn','fxa','fxb']
#This gets the data from yahoo finance
pnls = {i:dreader.DataReader(i,'yahoo','1985-01-01',datetime.today()) for i in symbols}
# These are the new columns that I want to add
pnls['PofChg'] = ((pnls.Close - pnls.Open) / (pnls.Open)) * 100
pnls['U_D_F'] = np.where(pnls.PofChg > 0 , 'Up', np.where(pnls.PofChg == 0, 'Flat', 'Down'));pnls
pnls['Up_Down'] = pnls.Close.diff()
pnls['Close%pd'] = pnls.Close.pct_change()*100
# This saves the current ticker to a csv file
for df_name in pnls:
pnls.get(df_name).to_csv("{}_data.csv".format(df_name), index=True, header=True)
這是我運行代碼時得到的錯誤
Traceback (most recent call last):
File "YahooFinanceDataGetter.py", line 14, in <module>
pnls['PofChg'] = ((pnls.Close - pnls.Open) / (pnls.Open)) * 100
AttributeError: 'dict' object has no attribute 'Close'
Press any key to continue . . .
線
pnls = {i:dreader.DataReader(i,'yahoo','1985-01-01',datetime.today()) for i in symbols}
構建一個python dict
(使用字典理解)。 要檢查這一點,您可以運行以下命令:
assert type(pnls) == dict
這是錯誤消息告訴您的內容: AttributeError: 'dict' object has no attribute 'Close'
。
DataFrames 實際上是字典的值。 要將轉換應用於它們,您可以迭代字典的values()
:
for df in pnls.values():
df = ((df.Close - df.Open) / (df.Open)) * 100
...
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