For 循环只给出 for 循环的最后一个结果

Question

我想打印数据直到 list_3 结束。但是，无论我如何尝试，我都只得到了 list_3 的最后一个结果。这是我的代码：

import FinanceDataReader as fdr 
import numpy as np
from numpy import NaN
import pandas as pd
import openpyxl 
....

pd.options.display.float_format = '{:.5f}'.format


file_list = os.listdir('/home/sejahui/projects/stock_data_excel')

list_1 = []
list_2 = []
list_3 =[ 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 ] 




for i in range(10): 



os.chdir('/home/sejahui/projects/stock_data_excel')
odd = file_list[i]

td = pd.read_excel('/home/sejahui/projects/stock_data_excel/'+str(odd))
td['Date'] = pd.to_datetime(td['Date'], format = '%Y-%m-%d' )



   for r in range(12):
      target_year = list_3[r]



data = td.query('Date.dt.year == @target_year')

'''
td['Year'] = td['Date'].dt.year
data = td.groupby(['Year'])
'''


def calMACD(data, short=5, long=25, signal=9):
    data.sort_index()
    
    data['MVA_25']=data['Close'].ewm(span=long, adjust=False).mean()
    data['MVA_5']=data['Close'].ewm(span=short, adjust=False).mean()
    data['MACD']=data['Close'].ewm(span=short, adjust=False).mean() - data['Close'].ewm(span=long, adjust=False).mean()
    data['Signal']=data['MACD'].ewm(span=signal, adjust=False).mean( )
    #data['Buy_sign']=(data['MACD']-data['Signal']) >=600
    data['Buy_sign']=np.where(data['MACD']-data['Signal'] >=451, 'Buy' , 'Sell' )
    #data['Target_1']=(data['Close']-data['Close'].shift(1))/data['Close'].shift(1)*100
    #data['Target_1']=np.where(data['Buy_sign']=='Buy', (data['Change'])+1,1)
    #data['Target_2']=np.where(data['Buy_sign']=='Sell', (data['Change'])+1,1)
    #data['Real_world']= 1000000*data['Target_1']
    #data['Real_world_2']= 1000000*data['Target_2'] 
    #data['Condition'] = np.where(data['Real_world']<1000000, data['Real_world']-data['Real_world'].shift(-2),1)
    ##data['Condition_2'] = np.where(data['Real_world']<1000000, data['Target_1'].shift(-2),1)
    #data['Moneyflow'] = 
    #plt.plot(data['Date'], data['Real_world'])
    #data[data.Buy_sign !='Sell']
    
    


    return data
print(calMACD(data), odd)

我尝试在 for 循环中使用 for 循环获取结果，但是，第二个 for 循环只给出了 for 循环的最后一个结果。我应该进行哪些更改才能获得第二个 for 循环的所有结果？

※注意：for 循环的第二个缩进可能看起来不正确，但是，它工作得很好，没有任何错误。

Answer 1

问题在于 for 循环范围内没有 td.query('Date.dt.year == @target_year')，将查询部分移动到 for 循环范围内以处理所有 target_year。

for r in range(12):
    target_year = list_3[r]
    data = td.query('Date.dt.year == @target_year')

另外，您可以将其优化为

for target_year in list_3:
    data = td.query('Date.dt.year == @target_year')