BUG: No longer can melt
name the columns for the labels of a MultiIndex
#58033
Labels
melt
name the columns for the labels of a MultiIndex
#58033
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
Running the example gives
We can melt the frame if we do not supply
var_name
, but the columns for the labels of theMultiIndex
will have the abstruse namesvariable_0
andvariable_1
.This bug may be related to #57663.
Expected Behavior
Versions strictly older than 2.2.0 behave thus.
Installed Versions
INSTALLED VERSIONS
commit : b552dc9
python : 3.12.2.final.0
python-bits : 64
OS : Linux
OS-release : 5.15.0-101-generic
Version : #111~20.04.1-Ubuntu SMP Mon Mar 11 15:44:43 UTC 2024
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : en_GB.UTF-8
LOCALE : en_GB.UTF-8
pandas : 3.0.0.dev0+618.gb552dc95c
numpy : 1.26.4
pytz : 2024.1
dateutil : 2.9.0.post0
setuptools : None
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 : None
IPython : None
pandas_datareader : None
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : None
bottleneck : None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : None
pyarrow : None
pyreadstat : None
python-calamine : None
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
zstandard : None
tzdata : 2024.1
qtpy : None
pyqt5 : None
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