Dataframe with incorrect index type returned when combining two tickers (one without data)

import yfinance as yf
df = yf.download( tickers = ["^NDX", "^TWII"],       
                  start="2023-01-22", end="2023-01-29",
                  interval = "1m",
                  group_by = 'column',
                  auto_adjust = False,
                  prepost = True,
                  threads = True,
                  proxy = None
                  )
[*********************100%***********************]  2 of 2 completed

1 Failed download:
- ^TWII: No data found for this date range, symbol may be delisted

It's not delisted, it's just there as there is no data due to the lunar new year.
The problem is the returned dataframe index is not a datetime index, but has type object)

yfinace version 0.2.9, python 3.10.8 on Linux ubuntu

What happens with other dates?

@asafravid

@asafravid Not helpful.

This appears to be a simple problem for someone to debug & fix, clue is one ticker doesn't return data so maybe messing up merge.

I’ll check

I had a look at this myself. Pandas concat now combines the empty dataframe and then fails to convert the timezone. I altered a try catch block in multi.py at line 155 to remove the empty dataframe and then everything seemed to work fine:

try:
        dfs = dict([(key, df) for key, df in shared._DFS.items() if not df.empty])
        data = _pd.concat(dfs.values(), axis=1, sort=True,
                          keys=dfs.keys())
    except Exception:
        _realign_dfs()
        data = _pd.concat(shared._DFS.values(), axis=1, sort=True,
                          keys=shared._DFS.keys())

Can you create a PR?

remove the empty dataframe

Is this best solution? My concern is users might think yfinance is failing to fetch and post Issues.

@
Looks resolved on dev. reindex_dfs now builds the union index only from non-empty frames, then reindexes the empty ticker onto it. Combining a populated 1m frame with a data-less ticker (utils.empty_df()) yields a DatetimeIndex (datetime64[us]), not an object index, so the concatenated result keeps a proper datetime index. Appears safe to close.
@

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Dataframe with incorrect index type returned when combining two tickers (one without data) #1382

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Dataframe with incorrect index type returned when combining two tickers (one without data) #1382

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asafravid commented on Feb 1, 2023

ValueRaider commented on Feb 1, 2023

asafravid commented on Feb 1, 2023

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