TypeError: super(type, obj): obj must be an instance or subtype of type

Giovanni Caridi

Hello, I'm starting to use Backtrader library. I had code some lines to download data from Yahoo Finance and add to cerebro.
But when I run the code I have this error, how can I fix it?

start = datetime.datetime(2014, 1, 1)
end = datetime.datetime(2019, 3, 1)

df = data.get_data_yahoo('UBI.MI', start, end)
df.to_csv('/Users/giovannicaridi/.spyder-py3/UBI.csv')

if __name__ == '__main__':          
                         
cerebro = bt.Cerebro() 

cerebro.addstrategy(Cross_Medie)

modpath = os.path.basename(os.path.abspath(sys.argv[0]))  
datapath = os.path.join(modpath,'/Users/giovannicaridi/.spyder-py3/UBI.csv')  


data = bt.feeds.YahooFinanceData(
dataname = datapath,
fromdate = datetime.datetime(2015,1,1),
todate = datetime.datetime(2018,12,31), 
reverse=False)   



File 
"/Users/giovannicaridi/opt/anaconda3/lib/python3.7/sitepackages/backtrader/feeds/yahoo.py", line 94, in start
super(YahooFinanceCSVData, self).start()
TypeError: super(type, obj): obj must be an instance or subtype of type

Thanks for you support

Regards,
Giovanni

run-out

Read about it here. You can do it just like in this.

    data = bt.feeds.YahooFinanceData(
        dataname="FB",
        fromdate=datetime.datetime(2020, 1, 1),
        todate=datetime.datetime(2020, 6, 30),
        reverse=False)

Giovanni Caridi

@run-out I changed my code but same error occured:

if __name__ == '__main__':          
                           

# Inizializzo istanza Cerebro
cerebro = bt.Cerebro() 

# Aggiungo una strategia
cerebro.addstrategy(Cross_Medie)

# Inizializzo il file (inserisco i dati storici mettendo il percorso completo del file
modpath = os.path.basename(os.path.abspath(sys.argv[0]))  

# Salvo i dati nella variabile data (Create a Data Feed)
data = bt.feeds.YahooFinanceData(
dataname = "FB",
fromdate = datetime.datetime(2015,1,1), # Do not pass values before this date
todate = datetime.datetime(2018,12,31), # Do not pass values after this date
reverse=False)   

# Aggiungiamo i dati a Cerebro
cerebro.adddata(data)

# Imposto il portafoglio depositando il capitale iniziale
capitale_iniziale = 100000
cerebro.broker.setcash(capitale_iniziale) 

# Imposto il numero di azioni che traderò
cerebro.addsizer(bt.sizers.FixedSize, stake=1000)

# Imposto il valore delle commissioni
cerebro.broker.setcommission(commission=0.0002)

# Stampo le condizioni iniziali
print('Valore iniziale Portafoglio: %.2f' % cerebro.broker.getvalue())

# Avvio l'instanza (il programma)
cerebro.run()    

# Stampo le condizioni finali
print('Valore del Portafoglio iniziale: %.2f' % cerebro.broker.getvalue())
cerebro.broker.getvalue()

run-out

I lifted your code;

data = bt.feeds.YahooFinanceData(
dataname = "FB",
fromdate = datetime.datetime(2015,1,1), # Do not pass values before this date
todate = datetime.datetime(2018,12,31), # Do not pass values after this date
reverse=False)

verbatum into my module and it works. So this means your setup must be missing something.

I had a look at the backtrader class for bt.feeds.YahooFinanceData and it indicates you must have the request library installed.

except ImportError:
msg = ('The new Yahoo data feed requires to have the requests '
'module installed. Please use pip install requests or '
'the method of your choice')

Have a look to see if you have requests installed.

Giovanni Caridi

@run-out said in TypeError: super(type, obj): obj must be an instance or subtype of type:

YahooFinanceData

I have these setting:

pip install backtrader

from future import (absolute_import, division, print_function,unicode_literals)
import backtrader as bt
import backtrader.indicators as btind
import backtrader.analyzers as btanalyzers
import datetime # For datetime objects
import os.path # To manage paths
import sys # To find out the script name (in argv[0])

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
pd.core.common.is_list_like = pd.api.types.is_list_like
from pandas_datareader import data, wb
import yfinance as yf
import datetime

Giovanni Caridi

I run the code into Jupyter using CSV file saved after Yahoo importing but no trades happened, porfolio values before and after the test is egual and no print out appear:

class Cross_Medie(bt.Strategy):
         params = (('Med_vel',50), ('Med_len', 100))

         # Inizializzo le due medie
  def __init__(self):
        self.sma_vel = btind.SMA(period = self.p.Med_vel)
        self.sma_len = btind.SMA(period = self.p.Med_len)
    
    # Definisco il segnale di acquisto/vendita
    self.buysig = btind.CrossOver(self.sma_vel, self.sma_len)
    
    # Salvo i dati di closing (self.datas[0] è l'orologio del sistema, 
    # utile per verificare se una candela in chiusura rompre una media/indicatore)
    # Keep a reference to the "close" line in the data[0] dataseries
    self.dataclose = self.datas[0].close

def next(self):

if  self.position.size:    # verifico se sono in posizione
    
      if self.buysig < 0:  # vuol dire che sono dentro long (incrocio a ribasso)
          self.close()     # chiudo la posizione esistente
          self.sell()      
        
      elif self.buysig > 0: # vuol dire che sono dentro short (incrocio a rialzo)
          self.close()      # chiudo la posizione esistente
          self.buy()
        
else:                     # non sono in posizione
         
    if self.buysig > 0:   # segnale positivo 
        self.buy()        # acquisto
        
    elif self.buysig < 0: # segnale negativo
        self.sell()       # vendo
        
      
def stampa(self, txt, dt=None):

      dt = dt or self.datas[0].datetime.date(0)  
      print('%s, %s' % (dt.isoformat(), txt))    


def notify_order(self, order):

       if order.status in [order.Submitted, order.Accepted]:
       # ordine acquisto/vendita accettato
       return

# Verifica se ordine completato
if order.status in [order.Completed]:
    if order.isbuy():
        # Stampo dettaglio di quantità, prezzo e commissioni
        self.stampa('ACQ ESEGUITO, QTY: %.2f, PREZZO: %.2f, COSTO: %.2f, COMM: %.2f')
        % (order.executed.size,order.executed.price,order.executed.comm))

        self.buyprice = order.executed.price
        self.buycomm = order.executed.comm

    else: # Vendita
        self.stampa('VEND ESEGUITA, QTY: %.2f, PREZZO: %.2f, COSTO: %.2f, COMM: %.2f')
        % (order.executed.size,order.executed.price,order.executed.comm))

        self.bar_executed = len(self)
        
elif order.status in [order.Canceled, order.Margin, order.Rejected]:
  self.stampa('Ordine Cancellato')
 
self.order = None    
  

def notify_trade(salef, trade):
if not trade.isclosed:
    return
self.stampa('PROFITTO OPERAZIONE, LORDO %.2f, NETTO %.2f' % (trade.pnl, trade.pnlcomm))        
        
    
dataAAPL = yf.download("AAPL", start="2015-01-01", end="2019-04-30")
dataAAPL.to_csv('/Users/giovannicaridi/.spyder-py3/AAPL.csv')

if __name__ == '__main__':       
                           

# Inizializzo istanza Cerebro
cerebro = bt.Cerebro() 

# Aggiungo una strategia
cerebro.addstrategy(Cross_Medie)

# Inizializzo il file (inserisco i dati storici mettendo il percorso completo del file
modpath = os.path.basename(os.path.abspath(sys.argv[0]))  
datapath = os.path.join(modpath, '/Users/giovannicaridi/.spyder-py3/AAPL.csv')

# Salvo i dati nella variabile data (Create a Data Feed)
data = bt.feeds.YahooFinanceData(
       dataname = datapath,
       fromdate = datetime.datetime(2016,1,1), # Do not pass values before this date
       todate = datetime.datetime(2018,12,31), # Do not pass values after this date
       reverse=False)   

# Aggiungiamo i dati a Cerebro
cerebro.adddata(data)
capitale_iniziale = 100000
cerebro.broker.setcash(capitale_iniziale) 

# Imposto il numero di azioni che traderò
cerebro.addsizer(bt.sizers.FixedSize, stake=1000)

# Imposto il valore delle commissioni
cerebro.broker.setcommission(commission=0.0002)

# Stampo le condizioni iniziali
print('Valore iniziale Portafoglio: %.2f' % cerebro.broker.getvalue())
cerebro.run()    

# Stampo le condizioni finali
print('Valore del Portafoglio finale: %.2f' % cerebro.broker.getvalue())
cerebro.broker.getvalue()

[100%**] 1 of 1 completed
Valore iniziale Portafoglio: 100000.00
Valore del Portafoglio finale: 100000.00

Giovanni Caridi

I tried now to re-run and appear this error:

File "<tokenize>", line 140
dataname = datapath,
^
IndentationError: unindent does not match any outer indentation level

run-out

@Giovanni-Caridi said in TypeError: super(type, obj): obj must be an instance or subtype of type:

if name == 'main':

After the if name == 'main': line, you must indent all of the following code by 4 spaces.

Giovanni Caridi

@run-out Done, but I have this output:

[100%**] 1 of 1 completed
Valore iniziale Portafoglio: 100000.00
Valore del Portafoglio finale: 100000.00

No print out, no trades happened..

Giovanni Caridi

In Spyder I have the same initial error:

File "/Users/giovannicaridi/opt/anaconda3/lib/python3.7/site-packages/backtrader/feeds/yahoo.py", line 94, in start
super(YahooFinanceCSVData, self).start()

TypeError: super(type, obj): obj must be an instance or subtype of type

Giovanni Caridi

This could be the solution?

In Python 3, using the new super().__init__() instead of super(Derived, self).__init__() solves the problem.
Source: https://stackoverflow.com/a/52898473/2476373