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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.
import pandas as pd a = pd.DataFrame([['1'],['2'],['3']],columns=['sales']) a_copy = a.copy() a_copy.loc[:,'sales'] = pd.Series(a['sales'], dtype='float64') a_copy.loc[:,'sales'] = pd.Series(a['sales'], dtype='float64[pyarrow]')
Set value for an entire column not working Using a_copy.loc[:,'sales']
Expected
commit : a60ad39 python : 3.11.5.final.0 python-bits : 64 OS : Windows OS-release : 10 Version : 10.0.22621 machine : AMD64 processor : Intel64 Family 6 Model 151 Stepping 2, GenuineIntel byteorder : little LC_ALL : None LANG : None LOCALE : Chinese (Simplified)_China.936 pandas : 2.1.2 numpy : 1.24.3 pytz : 2023.3.post1 dateutil : 2.8.2 setuptools : 68.0.0 pip : 23.2.1 Cython : None pytest : 7.4.0 hypothesis : None sphinx : 5.0.2 blosc : None feather : None xlsxwriter : None lxml.etree : 4.9.3 html5lib : None pymysql : 1.4.6 psycopg2 : None jinja2 : 3.1.2 IPython : 8.15.0 pandas_datareader : None bs4 : 4.12.2 bottleneck : 1.3.5 dataframe-api-compat: None fastparquet : None fsspec : 2023.4.0 gcsfs : None matplotlib : 3.7.2 numba : 0.57.1 numexpr : 2.8.4 odfpy : None openpyxl : 3.0.10 pandas_gbq : None pyarrow : 11.0.0 pyreadstat : None pyxlsb : None s3fs : 2023.4.0 scipy : 1.11.1 sqlalchemy : 1.4.39 tables : 3.8.0 tabulate : 0.8.10 xarray : 2023.6.0 xlrd : None zstandard : 0.19.0 tzdata : 2023.3 qtpy : 2.2.0 pyqt5 : None
The text was updated successfully, but these errors were encountered:
duplicate of #52593 - same underlying issue
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Closing as a duplicate
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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
Issue Description
Set value for an entire column not working

Using a_copy.loc[:,'sales']
Expected Behavior
Expected

Installed Versions
INSTALLED VERSIONS
commit : a60ad39
python : 3.11.5.final.0
python-bits : 64
OS : Windows
OS-release : 10
Version : 10.0.22621
machine : AMD64
processor : Intel64 Family 6 Model 151 Stepping 2, GenuineIntel
byteorder : little
LC_ALL : None
LANG : None
LOCALE : Chinese (Simplified)_China.936
pandas : 2.1.2
numpy : 1.24.3
pytz : 2023.3.post1
dateutil : 2.8.2
setuptools : 68.0.0
pip : 23.2.1
Cython : None
pytest : 7.4.0
hypothesis : None
sphinx : 5.0.2
blosc : None
feather : None
xlsxwriter : None
lxml.etree : 4.9.3
html5lib : None
pymysql : 1.4.6
psycopg2 : None
jinja2 : 3.1.2
IPython : 8.15.0
pandas_datareader : None
bs4 : 4.12.2
bottleneck : 1.3.5
dataframe-api-compat: None
fastparquet : None
fsspec : 2023.4.0
gcsfs : None
matplotlib : 3.7.2
numba : 0.57.1
numexpr : 2.8.4
odfpy : None
openpyxl : 3.0.10
pandas_gbq : None
pyarrow : 11.0.0
pyreadstat : None
pyxlsb : None
s3fs : 2023.4.0
scipy : 1.11.1
sqlalchemy : 1.4.39
tables : 3.8.0
tabulate : 0.8.10
xarray : 2023.6.0
xlrd : None
zstandard : 0.19.0
tzdata : 2023.3
qtpy : 2.2.0
pyqt5 : None
The text was updated successfully, but these errors were encountered: