Description
Pandas version checks
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I have checked that this issue has not already been reported.
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I have confirmed this bug exists on the latest version of pandas.
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I have confirmed this bug exists on the main branch of pandas.
Reproducible Example
import pandas as pd
ls = pd.Series([1, 2, 3, 4], index=[1, 2, 3, 4], name="left")
rs = pd.Series([3, 4, 5, 6], index=[3, 4, 5, 6], name="right")
pd.merge(ls, rs, how="cross")Issue Description
Above code produces
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Code\pandas_dev\pandas\pandas\core\reshape\merge.py", line 147, in merge
return _cross_merge(
File "C:\Code\pandas_dev\pandas\pandas\core\reshape\merge.py", line 210, in _cross_merge
left = left.assign(**{cross_col: 1})
File "C:\Code\pandas_dev\pandas\pandas\core\generic.py", line 6176, in __getattr__
return object.__getattribute__(self, name)
AttributeError: 'Series' object has no attribute 'assign'. Did you mean: 'align'?
Expected Behavior
No error is raised
Installed Versions
INSTALLED VERSIONS
commit : c126eeb
python : 3.10.11.final.0
python-bits : 64
OS : Windows
OS-release : 10
Version : 10.0.19045
machine : AMD64
processor : Intel64 Family 6 Model 158 Stepping 13, GenuineIntel
byteorder : little
LC_ALL : None
LANG : None
LOCALE : English_United States.1252
pandas : 2.1.0.dev0+1159.gc126eeb392
numpy : 1.24.3
pytz : 2023.3
dateutil : 2.8.2
setuptools : 67.7.2
pip : 23.1.2
Cython : 0.29.33
pytest : 7.3.2
hypothesis : 6.79.1
sphinx : 6.2.1
blosc : None
feather : None
xlsxwriter : 3.1.2
lxml.etree : 4.9.2
html5lib : 1.1
pymysql : 1.0.3
psycopg2 : 2.9.3
jinja2 : 3.1.2
IPython : 8.14.0
pandas_datareader: None
bs4 : 4.12.2
bottleneck : 1.3.7
brotli :
fastparquet : 2023.4.0
fsspec : 2023.6.0
gcsfs : 2023.6.0
matplotlib : 3.7.1
numba : 0.57.0
numexpr : 2.8.4
odfpy : None
openpyxl : 3.1.2
pandas_gbq : None
pyarrow : 12.0.0
pyreadstat : 1.2.2
pyxlsb : 1.0.10
s3fs : 2023.6.0
scipy : 1.10.1
snappy :
sqlalchemy : 2.0.16
tables : 3.8.0
tabulate : 0.9.0
xarray : 2023.5.0
xlrd : 2.0.1
zstandard : 0.19.0
tzdata : 2023.3
qtpy : None
pyqt5 : None