problem newly happened

guslijif

This problem never happened before:
not sure where goes wrong or maybe something wrong with the data feed?

Traceback (most recent call last):
File "/newVolume/DataAnalysis/backEnd/backTest.PY", line 85, in <module>
cerebro.run()
File "/home/li/.local/lib/python3.8/site-packages/backtrader/cerebro.py", line 1132, in run
runstrat = self.runstrategies(iterstrat)
File "/home/li/.local/lib/python3.8/site-packages/backtrader/cerebro.py", line 1298, in runstrategies
self._runonce(runstrats)
File "/home/li/.local/lib/python3.8/site-packages/backtrader/cerebro.py", line 1693, in _runonce
self._brokernotify()
File "/home/li/.local/lib/python3.8/site-packages/backtrader/cerebro.py", line 1365, in _brokernotify
self._broker.next()
File "/home/li/.local/lib/python3.8/site-packages/backtrader/brokers/bbroker.py", line 1233, in next
self._get_value() # update value
File "/home/li/.local/lib/python3.8/site-packages/backtrader/brokers/bbroker.py", line 433, in _get_value
comminfo = self.getcommissioninfo(data)
File "/home/li/.local/lib/python3.8/site-packages/backtrader/broker.py", line 80, in getcommissioninfo
if data._name in self.comminfo:
AttributeError: 'int' object has no attribute '_name'

backtrader

It will be difficult for anyone to provide an answer without a minimum reproducible sample.

But a long shot would indicate that the data feed has not been properly initialized, hence the lack of _name

guslijif

@backtrader

this is the data and data types that I feed in

backtrader

@guslijif

Quite difficult to reproduce anything from a picture. We don't even know how that's loaded, hence the comment before about a minimum reproducible sample.

Олег Шпагин

@backtrader Hello! Can you please approve these changes https://github.com/mementum/backtrader/pull/472 ?

1st commit: Option to change background for plotted value tags for dark theme - to get dark theme)))
When you use dark theme you need to change background for plotted value tags.

2nd commit: Fix: In last Python versions collections.Iterable -> collections.abcIterable - to work with Python 3.11+

**3rd commit: Fix: The set_view_interval, set_data_interval ... are removed. Now you can work with matplotlib > 3.6.x

Please review and approve it if you have time. Thanks!

guslijif

@backtrader Here I use getETFdata method which will return a dataframe that I provide picture above.
this pic show how I feed the data:

backtrader

See, I do understand that you have a problem but,

Pictures cannot be used to reproduce problems
Even if one typed in the entire text of your picture:
- It is not a complete script
- It contains no sample data

To start with so that you may grasp the difficulties of attempting something:

What is res?

In any case I do stand by my early diagnostic. The data feed has not been started, because assuming I believe the return of res is a dataframe, that's not how to add it to cerebro

See the documentation for PandasData: https://www.backtrader.com/docu/pandas-datafeed/pandas-datafeed/

guslijif

@backtrader res is a lib that I used to get the stock data frame by entering the stock code,I followed the documentation but still got the same error :

This is the code I have changed:

This is the dataframe that I feed in:

This is the output:

This problem is actually very weird because the strategy works properly before 2022-11-01. but after that day, it suddenly crashed. and this problem happens in some code stocks(actually happens in ETF 510760), for others, it works fine.