BUG: background_gradient obviously has a problem with colormaps

[JB-AM]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

#code from https://github.com/pandas-dev/pandas/issues/47695 that was working then!
import itertools
import numpy as np
import pandas as pd

df_rand = pd.DataFrame(index=range(5), columns=range(5), dtype=float)

for idx1, idx2 in itertools.combinations_with_replacement(df_rand.index, 2):
    df_rand.loc[idx1, idx2] = np.random.randint(0, 100)

df_rand.style.format("{:.0f}", na_rep="").background_gradient()

Issue Description

Long message error ending with:
AttributeError: module 'matplotlib' has no attribute 'colormaps'
<pandas.io.formats.style.Styler at 0x29dc7abfa90>

Expected Behavior

Show the expected background_gradient

Installed Versions

INSTALLED VERSIONS ------------------ commit : 2a953cf python : 3.9.7.final.0 python-bits : 64 OS : Windows OS-release : 10 Version : 10.0.19045 machine : AMD64 processor : Intel64 Family 6 Model 140 Stepping 1, GenuineIntel byteorder : little LC_ALL : None LANG : None LOCALE : fr_FR.cp1252

pandas : 2.1.3
numpy : 1.26.2
pytz : 2023.3.post1
dateutil : 2.8.2
setuptools : 57.4.0
pip : 23.3.1
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 3.1.2
IPython : 8.4.0
pandas_datareader : None
bs4 : 4.11.1
bottleneck : None
dataframe-api-compat: None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : 3.4.3
numba : None
numexpr : None
odfpy : None
openpyxl : 3.0.9
pandas_gbq : None
pyarrow : None
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : 1.11.4
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
zstandard : None
tzdata : 2023.3
qtpy : 2.1.0
pyqt5 : None

[attack68]

Have you tried with a more recent version of matplotlib (>3.4.3 from 2021)?

[JB-AM]

You’re right, with matplotlib 3.8.2, it works.
However, should the dependancy/minimum version requirement not have raised a warning at some pip install or check step?

[attack68]

Yes that is true but managing every sinlge one of pandas dependencies for all its functions in all pandas versions is a very difficult task.

[phofl]

Closing here