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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 pd.DataFrame({'x': [1], 'y': [2]}).apply(list, axis="columns") pd.DataFrame({'x': [1], 'y': [2]}).apply(list[int], axis="columns")
Traceback:
[... skipping similar frames: Series.apply at line 4935 (593 times), NDFrameApply.agg_or_apply_list_like at line 744 (592 times), SeriesApply.apply at line 1412 (592 times), Apply.apply_list_or_dict_like at line 630 (592 times), Apply.compute_list_like at line 369 (592 times)] File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/apply.py:1412, in SeriesApply.apply(self) ... File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/apply.py:630, in Apply.apply_list_or_dict_like(self) ... File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/apply.py:744, in NDFrameApply.agg_or_apply_list_like(self, op_name) ... File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/apply.py:369, in Apply.compute_list_like(self, op_name, selected_obj, kwargs) ... File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/series.py:4935, in Series.apply(self, func, convert_dtype, args, by_row, **kwargs) ... File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/apply.py:1407, in SeriesApply.apply(self) 1404 def apply(self) -> DataFrame | Series: 1405 obj = self.obj -> 1407 if len(obj) == 0: 1408 return self.apply_empty_result() 1410 # dispatch to handle list-like or dict-like File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/series.py:918, in Series.__len__(self) 914 def __len__(self) -> int: 915 """ 916 Return the length of the Series. 917 """ --> 918 return len(self._mgr) File /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/internals/base.py:76, in DataManager.__len__(self) 74 @final 75 def __len__(self) -> int: ---> 76 return len(self.items) RecursionError: maximum recursion depth exceeded > /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/internals/base.py(76)__len__() 74 @final 75 def __len__(self) -> int: ---> 76 return len(self.items) 77 78 @property ipdb>
where self.func is regarded as list of funcs, which lead to the bug
self.func
> /opt/homebrew/envs/pandera/lib/python3.12/site-packages/pandas/core/apply.py(1412)apply() 1410 # dispatch to handle list-like or dict-like 1411 if is_list_like(self.func): -> 1412 return self.apply_list_or_dict_like() 1413 1414 if isinstance(self.func, str): ipdb> p self.func *list[int] ipdb> p is_list_like(self.func) True ipdb>
Expected output:
0 [1, 2] dtype: object
commit : 2cc3762 python : 3.12.9 python-bits : 64 OS : Darwin OS-release : 24.5.0 Version : Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:33 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T8122 machine : arm64 processor : arm byteorder : little LC_ALL : None LANG : zh_CN.UTF-8 LOCALE : zh_CN.UTF-8
pandas : 2.3.0 numpy : 2.2.6 pytz : 2025.2 dateutil : 2.9.0.post0 pip : 25.0.1 Cython : None sphinx : None IPython : 8.31.0 adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : None blosc : None bottleneck : None dataframe-api-compat : None fastparquet : None fsspec : None html5lib : None hypothesis : None gcsfs : None jinja2 : None lxml.etree : None matplotlib : None numba : None numexpr : None odfpy : None openpyxl : None pandas_gbq : None psycopg2 : None pymysql : None pyarrow : None pyreadstat : None pytest : 8.3.4 python-calamine : None pyxlsb : None s3fs : None scipy : None sqlalchemy : None tables : None tabulate : None xarray : None xlrd : None xlsxwriter : None zstandard : 0.23.0 tzdata : 2025.2 qtpy : None pyqt5 : None
The text was updated successfully, but these errors were encountered:
No branches or pull requests
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
Traceback:
where
self.func
is regarded as list of funcs, which lead to the bugExpected Behavior
Expected output:
Installed Versions
INSTALLED VERSIONS
commit : 2cc3762
python : 3.12.9
python-bits : 64
OS : Darwin
OS-release : 24.5.0
Version : Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:33 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T8122
machine : arm64
processor : arm
byteorder : little
LC_ALL : None
LANG : zh_CN.UTF-8
LOCALE : zh_CN.UTF-8
pandas : 2.3.0
numpy : 2.2.6
pytz : 2025.2
dateutil : 2.9.0.post0
pip : 25.0.1
Cython : None
sphinx : None
IPython : 8.31.0
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : None
blosc : None
bottleneck : None
dataframe-api-compat : None
fastparquet : None
fsspec : None
html5lib : None
hypothesis : None
gcsfs : None
jinja2 : None
lxml.etree : None
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
psycopg2 : None
pymysql : None
pyarrow : None
pyreadstat : None
pytest : 8.3.4
python-calamine : None
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
xlsxwriter : None
zstandard : 0.23.0
tzdata : 2025.2
qtpy : None
pyqt5 : None
The text was updated successfully, but these errors were encountered: