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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
df = pd.DataFrame(dict(i=[1,2,3], j=[1,1,2], x=[10, 100, 1000])).set_index(["i", "j"])
key = (1, 1)
# Returns DataFrame as expected:
result1 = df.xs(key, drop_level=False, level=list(range(len(key))))
# Returns Series, but DataFrame was expected:
result2 = df.xs(key, drop_level=False)Issue Description
The drop_level=False option in DataFrame.xs apparently has no effect when level= is left at its default option. The documentation states that level= being unset should be equivalent to something like level=level=list(range(len(key))) when key is a non-string sequence.
Expected Behavior
I expected drop_level=False to have the same effect regardless of whether level= was specified.
Installed Versions
Output from pd.show_versions()
INSTALLED VERSIONS
------------------
commit : d9cdd2ee5a58015ef6f4d15c7226110c9aab8140
python : 3.11.9.final.0
python-bits : 64
OS : Darwin
OS-release : 23.4.0
Version : Darwin Kernel Version 23.4.0: Fri Mar 15 00:10:42 PDT 2024; root:xnu-10063.101.17~1/RELEASE_ARM64_T6000
machine : arm64
processor : arm
byteorder : little
LC_ALL : en_US.UTF-8
LANG : en_US.UTF-8
LOCALE : en_US.UTF-8
pandas : 2.2.2
numpy : 1.26.4
pytz : 2024.1
dateutil : 2.9.0
setuptools : 69.5.1
pip : 24.0
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 3.1.3
IPython : 8.25.0
pandas_datareader : None
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : 4.12.3
bottleneck : 1.4.0
dataframe-api-compat : None
fastparquet : None
fsspec : 2023.12.2
gcsfs : None
matplotlib : 3.8.4
numba : 0.59.1
numexpr : 2.10.0
odfpy : None
openpyxl : 3.1.4
pandas_gbq : None
pyarrow : 15.0.2
pyreadstat : None
python-calamine : None
pyxlsb : None
s3fs : 2023.12.2
scipy : 1.13.1
sqlalchemy : None
tables : None
tabulate : 0.9.0
xarray : 2024.6.0
xlrd : None
zstandard : None
tzdata : 2024.1
qtpy : None
pyqt5 : None
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Related to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves