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Reproducible Example

import pandas as pd
df = pd.DataFrame({"A": [1., 2.], "B": [3., 4.]})
styler1 = df.style.format(precision=2)
styler2 = df.agg(["sum"]).style
styler3 = df.agg(["prod"]).style
print(styler1.concat(styler2).concat(styler3).to_string())

Issue Description

The new style.concat option can be used to add styled dataframes to each other. A user might want to add several dataframes in this manner. The natural way to do it is styler1.concat(styler2).concat(styler3). However in this case, styler2 is silently discarded. A workaround that give the expected output is to use styler1.concat(styler2.concat(styler3)). I think that this method is not obvious, and can get ugly when the code is longer.

>>> print(styler1.concat(styler2.concat(styler3)).to_string())  # gets expected output
 A B
0 1.00 3.00
1 2.00 4.00
sum 3.000000 7.000000
prod 2.000000 12.000000

>>> print(styler.concat(styler2).concat(styler3).to_string())  # styler2 is dropped
 A B
0 1.00 3.00
1 2.00 4.00
prod 2.000000 12.000000

Expected Behavior

>>> print(styler.concat(styler2).concat(styler3).to_string())
 A B
0 1.00 3.00
1 2.00 4.00
sum 3.000000 7.000000
prod 2.000000 12.000000

Installed Versions

INSTALLED VERSIONS ------------------ commit : fe93a8395081f9887ca2a8119f9ce42614b1ae23 python : 3.8.13.final.0 python-bits : 64 OS : Linux OS-release : 4.4.0-19041-Microsoft Version : #1237-Microsoft Sat Sep 11 14:32:00 PST 2021 machine : x86_64 processor : x86_64 byteorder : little LC_ALL : None LANG : en_US.UTF-8 LOCALE : en_US.UTF-8 pandas : 1.0.0rc0+8877.gfe93a83950 numpy : 1.23.4 pytz : 2022.5 dateutil : 2.8.2 setuptools : 65.5.0 pip : 22.3 Cython : 0.29.32 pytest : 7.1.3 hypothesis : 6.56.3 sphinx : 4.5.0 blosc : None feather : None xlsxwriter : 3.0.3 lxml.etree : 4.9.1 html5lib : 1.1 pymysql : 1.0.2 psycopg2 : 2.9.3 jinja2 : 3.0.3 IPython : 8.5.0 pandas_datareader: 0.10.0 bs4 : 4.11.1 bottleneck : 1.3.5 brotli : fastparquet : 0.8.3 fsspec : 2021.11.0 gcsfs : 2021.11.0 matplotlib : 3.6.1 numba : 0.56.3 numexpr : 2.8.3 odfpy : None openpyxl : 3.0.10 pandas_gbq : 0.17.9 pyarrow : 9.0.0 pyreadstat : 1.1.9 pyxlsb : 1.0.10 s3fs : 2021.11.0 scipy : 1.9.2 snappy : sqlalchemy : 1.4.42 tables : 3.7.0 tabulate : 0.9.0 xarray : 2022.10.0 xlrd : 2.0.1 xlwt : 1.3.0 zstandard : 0.18.0 tzdata : None

Comment From: tsvikas

.to_string() is here to give a minimal example, the issues exists in any styler format, and visible in jupyter notebooks, etc.

Comment From: tsvikas

Also, I would be glad to submit a PR with a fix for this issue