error encountered in yahoo downloader in the very first tutorial notebook

[RandyChen233]

Hi,

I tried running the tutorial in Google colab (the first tutorial notebook), and everything at the beginning ran without errors until this line

df = YahooDownloader(start_date = TRAIN_START_DATE,
                     end_date = TRADE_END_DATE,
                     ticker_list = config_tickers.DOW_30_TICKER).fetch_data()

I'm getting the following error:

[*********************100%***********************]  1 of 1 completed

1 Failed download:
- AXP: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- AMGN: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- AAPL: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- BA: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- CAT: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- CSCO: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- CVX: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- GS: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- HD: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- HON: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- IBM: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- INTC: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- JNJ: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- KO: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- JPM: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- MCD: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- MMM: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- MRK: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- MSFT: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- NKE: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- PG: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- TRV: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- UNH: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- CRM: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- VZ: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- V: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- WBA: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- WMT: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- DIS: No data found for this date range, symbol may be delisted
[*********************100%***********************]  1 of 1 completed

1 Failed download:
- DOW: No data found for this date range, symbol may be delisted
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
[<ipython-input-50-b49b1e107d2c>](https://localhost:8080/#) in <cell line: 1>()
----> 1 df = YahooDownloader(start_date = TRAIN_START_DATE,
      2                      end_date = TRADE_END_DATE,
      3                      ticker_list = config_tickers.DOW_30_TICKER).fetch_data()

[/usr/local/lib/python3.9/site-packages/finrl/meta/preprocessor/yahoodownloader.py](https://localhost:8080/#) in fetch_data(self, proxy)
     58                 num_failures += 1
     59         if num_failures == len(self.ticker_list):
---> 60             raise ValueError("no data is fetched.")
     61         # reset the index, we want to use numbers as index instead of dates
     62         data_df = data_df.reset_index()

ValueError: no data is fetched.

Is yahooDownloader broken?

[shql-tgr]

The problem (at least in my case) was a conflict between the newest version of Pandas (2.0.0) and yfinance. Downgrading Pandas to 1.5.3 did the trick (if you're using Colab, just run !pip install pandas==1.5.3 before importing the library)

[randheerDas]

I did downgrade pandas to 1.5.3. This did not resolve the issue. Is somebody from Finrl Team looking into this? This is very important, as we plan to demonstrate these capabilities to an important customer