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#7697·modin

BUG: `Resample.mean()` raises error on pandas 2.3.3 with native execution

Author: sfc-gh-joshiCreated Apr 16, 2026Updated Apr 16, 2026
Labelsbug 🦗P3

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Reproducible Example

python
from modin.config import Backend
Backend.put("pandas")
import modin.pandas as pd
idx = pd.date_range("2018-01-01", periods=5, freq="h")
ts = pd.Series(range(len(idx)), index=idx)
ts.resample("2h").mean()
# ValueError: Unsupported value _NoDefault.no_default for `convention`

Issue Description

https://github.com/pandas-dev/pandas/pull/62480 pandas 2.3.3 changed the default value of the convention argument to be "start" rather than no_default, which modin continues to transparently pass through to pandas. The fix here is to modify the default arguments for resample in base.py: https://github.com/modin-project/modin/blob/7ca200b08597ed6ecfd2db2d08bd322f83c2cec1/modin/pandas/base.py#L2626-L2639

Expected Behavior

Should not error.

Error Logs

python-traceback

Traceback (most recent call last):
  File "<python-input-13>", line 1, in <module>
    ts.resample("2h").mean()
    ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/logging/logger_decorator.py", line 149, in run_and_log
    result = obj(*args, **kwargs)
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/pandas/resample.py", line 311, in mean
    query_compiler=self._query_compiler.resample_mean(
        self.resample_kwargs,
        *args,
        **kwargs,
    )
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/logging/logger_decorator.py", line 149, in run_and_log
    result = obj(*args, **kwargs)
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/core/storage_formats/base/query_compiler.py", line 6059, in resample_mean
    return ResampleDefault.register(pandas.core.resample.Resampler.mean)(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        self, resample_kwargs, *args, **kwargs
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/core/dataframe/algebra/default2pandas/default.py", line 207, in args_cast
    return wrapper(self, *args, **kwargs)
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/core/dataframe/algebra/default2pandas/default.py", line 254, in wrapper
    return self.default_to_pandas(fn, *args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/logging/logger_decorator.py", line 149, in run_and_log
    result = obj(*args, **kwargs)
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/core/storage_formats/base/query_compiler.py", line 315, in default_to_pandas
    result = pandas_op(try_cast_to_pandas(self), *args, **kwargs)
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/core/dataframe/algebra/default2pandas/default.py", line 127, in applyier
    result = fn(df, *args, **kwargs)
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/modin/core/dataframe/algebra/default2pandas/resample.py", line 47, in fn
    resampler = df.resample(**resample_kwargs)
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/pandas/core/generic.py", line 9834, in resample
    return get_resampler(
        cast("Series | DataFrame", self),
    ...<10 lines>...
        group_keys=group_keys,
    )
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/pandas/core/resample.py", line 2043, in get_resampler
    tg = TimeGrouper(obj, **kwds)  # type: ignore[arg-type]
  File "/Users/joshi/miniconda3/envs/snowpandas-314/lib/python3.14/site-packages/pandas/core/resample.py", line 2123, in __init__
    raise ValueError(f"Unsupported value {convention} for `convention`")
ValueError: Unsupported value _NoDefault.no_default for `convention`

Installed Versions

INSTALLED VERSIONS

commit : bce3707443d525cdca5c50f9c5e65f2f82fcc882 python : 3.14.3 python-bits : 64 OS : Darwin OS-release : 25.4.0 Version : Darwin Kernel Version 25.4.0: Thu Mar 19 19:31:17 PDT 2026; root:xnu-12377.101.15~1/RELEASE_ARM64_T6020 machine : arm64 processor : arm byteorder : little LC_ALL : None LANG : en_US.UTF-8 LOCALE : en_US.UTF-8

Modin dependencies

modin : 0.37.1 ray : None dask : None distributed : None

pandas dependencies

pandas : 2.3.3 numpy : 2.4.4 pytz : 2026.1.post1 dateutil : 2.9.0.post0 pip : 26.0.1 Cython : None sphinx : 5.0.2 IPython : None adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : None blosc : None bottleneck : None dataframe-api-compat : None fastparquet : None fsspec : 2026.3.0 html5lib : None hypothesis : None gcsfs : None jinja2 : 3.1.6 lxml.etree : 6.0.4 matplotlib : 3.10.8 numba : None numexpr : None odfpy : None openpyxl : 3.1.5 pandas_gbq : None psycopg2 : None pymysql : None pyarrow : 23.0.1 pyreadstat : None pytest : 7.4.4 python-calamine : None pyxlsb : None s3fs : None scipy : None sqlalchemy : None tables : None tabulate : None xarray : None xlrd : None xlsxwriter : None zstandard : None tzdata : 2026.1 qtpy : None pyqt5 : None

Source: modin-project/modin

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