FutureWarning: from base.py : _empty_series = pd.Series()

[gene-git]

FYI - today I started getting this warning from latest git ::

.../yfinance/base.py:48: FutureWarning: The default dtype for empty Series will be 'object' instead of 'float64' in a future version. Specify a dtype explicitly to silence this warning.
  _empty_series = pd.Series()

[ValueRaider]

@mreiche #1724

[mreiche]

@gene-git Upgrading to pandas>=2.0.0 prevents this output.

References:

• API: Use object dtype for empty Series pandas-dev/pandas#17261
• API: Use object dtype for empty Series pandas-dev/pandas#29405
• DEPR: Enforce empty Series returning object dtype pandas-dev/pandas#49342
• When change default dtype for empty Series? pandas-dev/pandas#42078
• DEPR: log of deprecations in 1.x (to be removed in 2.0) pandas-dev/pandas#30228

[gene-git]

Yeh thank you @mreiche - Arch is very out of date for some reason - 1.5.3

[gene-git]

here are lots of version restrictions on building pandas (2.2.0 or git head) so be bit of a pain for me to do - think I'll wait for arch to update.

So, should we close this ?

[mreiche]

You could try something like suppressing FutureWarnings: https://stackoverflow.com/questions/15777951/how-to-suppress-pandas-future-warning, get back with our solution and then close :)

[gene-git]

I put this in my application - added these lines (import warnings and import pandas ::

import warnings
import pandas
import yfinance as yf

and then at the top of main I put:

warnings.simplefilter(action='ignore', category=FutureWarning)
_unused_dummy = pd.Series()

then run my program - still emits same warning in yf but not from my dummy

/usr/lib/python3.11/site-packages/yfinance/base.py:48: FutureWarning: The default dtype for empty Series will be 'object' instead of 'float64' in a future version. Specify a dtype explicitly to silence this warning.
  _empty_series = pd.Series()

[gene-git]

Is there a reason not to follow the suggestion and simply add dtype to the pd.Series() line?

[mreiche]

then run my program - still emits same warning in yf but not from my dummy

/usr/lib/python3.11/site-packages/yfinance/base.py:48: FutureWarning: The default dtype for empty Series will be 'object' instead of 'float64' in a future version. Specify a dtype explicitly to silence this warning.
  _empty_series = pd.Series()

The reason here is, that _empty_series gets instanced at the very beginning of the whole yfinance module, before you disabled warnings.

Try

import warnings

warnings.simplefilter(action='ignore', category=FutureWarning)

import yfinance as yf

Unfortunately, _empty_series still exists due merge conflicts beforehand. This can easily be fixed with another PR. Let me get back here soon.

[mreiche]

Is there a reason not to follow the suggestion and simply add dtype to the pd.Series() line?

IMHO, it's outdated and fixed in current versions. Why beeing upwards-compatible for these edge cases? It's not my decision to support pandas<2 and not beeing fully compatible. Nobody else complaint about this, so I guess it's not a popular thing.

[gene-git]

Okidok - moving the warning above import as you suggest works fine too.

thanks

Yeh I am fine with ignoring outdated stuff too. It's rare for arch to be this far behind on package.

[mreiche]

@gene-git FYI, I'm using Alpine in my experimental branch and I was able to install newer versions of pandas using the python:3.11-alpine base image:

# cat /etc/alpine-release 
3.19.0
# pip list | grep pandas
pandas          2.1.4