Description
Pandas version checks
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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.
Reproducible Example
import pandas as pd
# FAILS
pd.MultiIndex.from_product(
[
pd.DatetimeIndex([]),
],
names=["A"],
).set_levels(pd.DatetimeIndex([]), level="A")
# WORKS
pd.MultiIndex.from_product(
[
pd.DatetimeIndex([]),
],
names=["A"],
).set_levels(pd.DatetimeIndex([pd.Timestamp("20220101")]), level="A")Issue Description
The code block with the "FAILS" comment above should complete without error, instead it yields
Traceback (most recent call last):
File "<string>", line 1, in <module>
File ".../lib/python3.9/site-packages/pandas/util/_decorators.py", line 317, in wrapper
return func(*args, **kwargs)
File ".../lib/python3.9/site-packages/pandas/core/indexes/multi.py", line 936, in set_levels
level, levels = _require_listlike(level, levels, "Levels")
File ".../lib/python3.9/site-packages/pandas/core/indexes/multi.py", line 4006, in _require_listlike
if is_list_like(arr[0]):
File ".../lib/python3.9/site-packages/pandas/core/indexes/base.py", line 5365, in __getitem__
return getitem(key)
File ".../lib/python3.9/site-packages/pandas/core/arrays/datetimelike.py", line 360, in __getitem__
"Union[DatetimeLikeArrayT, DTScalarOrNaT]", super().__getitem__(key)
File ".../lib/python3.9/site-packages/pandas/core/arrays/_mixins.py", line 289, in __getitem__
result = self._ndarray[key]
IndexError: index 0 is out of bounds for axis 0 with size 0
The code block with the "WORKS" comment does not fail, which might facilitate debugging/fixing the issue.
Expected Behavior
Code should complete without error.
Installed Versions
INSTALLED VERSIONS
commit : bf856a8
python : 3.9.13.final.0
python-bits : 64
OS : Linux
OS-release : 5.10.102.1-microsoft-standard-WSL2
Version : #1 SMP Wed Mar 2 00:30:59 UTC 2022
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : C.UTF-8
LOCALE : en_US.UTF-8
pandas : 1.6.0.dev0+145.gbf856a85a
numpy : 1.22.3
pytz : 2022.1
dateutil : 2.8.2
setuptools : 63.4.1
pip : 22.1.2
Cython : None
pytest : 7.1.2
hypothesis : None
sphinx : 5.0.2
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : 1.1
pymysql : None
psycopg2 : None
jinja2 : 3.0.3
IPython : 8.4.0
pandas_datareader: None
bs4 : 4.11.1
bottleneck : 1.3.5
brotli :
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : 3.5.2
numba : 0.55.2
numexpr : 2.8.3
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : 6.0.0
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : 1.7.3
snappy : None
sqlalchemy : 1.4.41
tables : None
tabulate : 0.8.10
xarray : 0.20.1
xlrd : None
xlwt : None
zstandard : None
tzdata : None