Problemsby Glyphpandas users keep filing bugs
26 posts from 19 people18d activeFading, +1 this week
Posts per day
The posts behind it
Need Advice on an Automated Data Collection System
Hello developers!. I am developing a B2B buyer intelligence project.. I want to automatically collect, clean, store and update company information every day.. I am considering Python, Pandas, MongoDB and APScheduler.. Which architecture and open-source technologies would you...
CI: pandas-stubs tests fail against pandas nightly
@pandas-dev/pandas-stubs-team the pandas-stubs tests are failing against pandas nightly. This issue is managed by the `stubs_tests` job in `.github/workflows/wheels.yml` and closes on the next passing run. Closing it by hand while the tests still fail opens a new one on the next...
ENH: `ListAccessor.contains`
### Feature Type - [x] Adding new functionality to pandas - [ ] Changing existing functionality in pandas - [ ] Removing existing functionality in pandas ### Problem Description Since pandas 3.1, a Polars Dataframe columns with dtypes like `list [pyarrow]` have their dtype...
"Show full range for time shift" fails when the shifted period has no data (7.0.0rc2)
### Bug description With a time shift and **Show full range for time shift** (#41334) on, a chart fails with "Data error: One or more chart-data queries failed" when the shifted period has no rows. With the option off, the same chart renders fine. Present in `7.0.0rc2` and...
RLS: 3.1.x releases
Issue to track the 3.1.x bug-fix releases
BUG: Logical OR does not obey Kleene three-valued logic
...: None IPython : None adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : None bottleneck : None fastparquet : None fsspec : None html5lib : None gcsfs : None jinja2 : None lxml.etree : None matplotlib : None numba : None numexpr : None odfpy : None openpyxl : None...
BUG: on RISC-V NaN goes to INT_MAX
...IPython : 9.17.1 adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : 4.15.0 bottleneck : 1.6.0 fastparquet : None fsspec : 2026.9.0 html5lib : 1.1 hypothesis : 6.151.9 gcsfs : None jinja2 : 3.1.6 lxml.etree : 6.1.2 matplotlib : 3.11.2 numba : None numexpr : 2.14.1 odfpy...
`dt.offset_by` keeps the sorted flag when the result overflows and wraps around
### Checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars. ### Reproducible example ### Log output ### Issue description 2262-04-11 + 1 day doesn't fit...
DOC: pyarrow.Array.to_pandas vs ArrowExtensionArray
### Pandas version checks - [x] I have checked that the issue still exists on the latest versions of the docs on `main` [here](https://pandas.pydata.org/docs/dev/) ### Location of the documentation https://pandas.pydata.org/docs/user_guide/pyarrow.html ### Documentation problem...
CI: pandas-stubs tests fail against pandas nightly
[Workflow Run URL](https://github.com/pandas-dev/pandas/actions/runs/38677170119) Python 3.13 Test Summary
Does loadTable().to_pandas() transfer all data or only metadata first?
When using the Python API, I want to understand the data transfer behavior of loadTable vs to_pandas . The database table has millions of rows and I don't want to accidentally trigger a full transfer.. import dolphindb as ddb s = ddb.session() s.connect("localhost", 8848,...
CI: pandas-stubs tests fail against pandas nightly
[Workflow Run URL](https://github.com/pandas-dev/pandas/actions/runs/38201489513) Python 3.13 Test Summary
DOC: Fix docs signature for various offset constructors
### Pandas version checks - [x] I have checked that the issue still exists on the latest versions of the docs on `main` [here](https://pandas.pydata.org/docs/dev/) ### Location of the documentation Multiple offset classes in pandas.tseries.offsets. Examples: - BusinessDay -...
How should I best structure my data for use for my analytics
Hello data engineers, I am here in order to get some help for a hobby. I'm trying to figure out how to structure my data. I'll try to explain the use-case in order for you guys to understand.. I analyze numbers, from different sources to create stories that explain what is going...
BUG: `pandas` allows comparing complex numbers
...None IPython : None adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : 4.15.0 bottleneck : None fastparquet : None fsspec : 2026.7.0 html5lib : 1.1 hypothesis : None gcsfs : None jinja2 : 3.1.6 lxml.etree : 6.1.1 matplotlib : 3.11.1 numba : None numexpr : 2.14.2 odfpy...
Pandas 'drop_duplicates' not removing rows
I am reading a csv into a dataFrame with the goal of filtering duplicate entries and storing their id's. csv: . Name,Hash,Id,Tag,Rarity,Tier,Type,Source,Archetype,Tertiary Stat,Tuning Stat AION Adapter Bond,119770768,"""6917530158183792231""",,Legendary,5,Warlock...
BUG: .to_latex() throws an exception in some cases
...IPython : 9.16.1 adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : 4.15.0 bottleneck : 1.6.0 fastparquet : None fsspec : 2026.7.0 html5lib : 1.1 hypothesis : 6.151.9 gcsfs : None jinja2 : 3.1.6 lxml.etree : 6.1.1 matplotlib : 3.11.1 numba : None numexpr : 2.14.1 odfpy...
TST: pandas/tests/api/test_api.py::TestApi::test_api fails when that directory is run on its own
`TestApi.allowed_api_dirs` in `pandas/tests/api/test_api.py` lists `"internals"`, and `test_api` compares that list against `dir(pandas.api)`. But `pandas/api/__init__.py` does not import the `internals` submodule, and a submodule only shows up in its parent's `dir()` once...
BUILD: window/meson.build never passes --shared=pandas._libs._cyutility to its extensions
`pandas/_libs/window/meson.build` opens with but both `py.extension_module` calls in that file pass `cython_args: cy_args`. The `+=` lands on `cython_args`, the variable inherited from `pandas/_libs/meson.build` (which already appends the same flag there), so the flag never...
BUILD: pyproject.toml banned-api comment is wrong — TID251 does resolve np.random through the alias
`pyproject.toml` carries this in `[tool.ruff.lint.flake8-tidy-imports.banned-api]`: The premise is false. TID251 resolves qualified names through aliased module imports, so with `import numpy as np` a `"numpy.random"` entry does flag `np.random.rand()` at the call site. Verified...
Pandas is eagerly imported as a result of cache_policies.py
### Bug summary [`_register_stable_transforms()`](https://github.com/PrefectHQ/prefect/blob/3a128c2b55d57bf30f9db28c2148bba5e5b6c145/src/prefect/cache_policies.py#L404) in `cache_policies.py` eagerly imports pandas if a user happens to have it installed in their environment...
BUG: IndexError with certain subplot order in stacked barchart
...IPython : 9.16.1 adbc-driver-postgresql: None adbc-driver-sqlite : None bs4 : 4.15.0 bottleneck : None fastparquet : None fsspec : None html5lib : None hypothesis : None gcsfs : None jinja2 : 3.1.6 lxml.etree : 6.1.1 matplotlib : 3.11.1 numba : 0.67.0 numexpr : None odfpy : None...
BUG: IntervalDtype.__from_arrow__ ignores the struct-level validity bitmap
### Reproducible Example ### Issue Description The second entry is null in the arrow array but reads back as `(0.0, 0.0]` instead of NA. `IntervalDtype.__from_arrow__` reads only `arr.field("left")` / `arr.field("right")`. pyarrow's `StructArray.field()` does not merge the...
BUG: Issues with stacked/grouped bars in subplot charts
### Pandas version checks - [x] I have checked that this issue has not already been reported. - [x] I have confirmed this bug exists on the [latest version](https://pandas.pydata.org/docs/whatsnew/index.html) of pandas. - [x] I have confirmed this bug exists on the [main...
Companies and products named
About this problem
Evidence
26 posts from 19 people in 6 places, about 3 a week over 69 days. Mostly on pandas-dev/pandas, Stack Overflow [pandas], r/dataengineering. Tools named alongside: GitHub, PostgreSQL, SQLite, Polars.
Frustration Frustration 0 of 3· Seen on GitHub issues, Stack Overflow, Reddit
Summary, model-written
Pandas library users face unwanted eager imports by external tools, unclear data transfer behaviors, and formatting issues when loading CSV files into dataframes.
How it was grouped
Posts about pandas that state a pain but match no known issue yet. First post Aug 28, 2026, latest Nov 4, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
Other pandas problems
pandas upgrades break working setups
10 posts from 10 people on GitHub issues.
Trouble with pandas dataframe
Top post: "HDFStore.select with where=cat == None returns empty DataFrame for Categorical columns instead of matching", one of 8 posts from 7 people on GitHub issues, Stack Overflow.
pandas deprecations force unplanned migrations
7 posts from 6 people on GitHub issues.
Trouble with pandas series
Top post: "Series arithmetic ops with PyArrow dtypes and scalars can upcast", one of 5 posts from 4 people on GitHub issues, Stack Overflow.
Trouble with pandas read
Top post: "CI: sanitizers environment has no pyarrow, so the read_csv pyarrow string path is never sanitized", one of 5 posts from 5 people on GitHub issues.
Trouble with pandas raises
Top post: "read_csv with usecols raises IndexError in low-memory mixed-dtype warning path", one of 5 posts from 5 people on GitHub issues.
pandas error messages are cryptic
5 posts from 5 people on GitHub issues.
Trouble with pandas index
Top post: "DOC: document `pd.Index.to_flat_index`", one of 4 posts from 4 people on GitHub issues.
Trouble with pandas instead
Top post: "`pd.merge` gives `float`s instead of integer extensions", one of 4 posts from 4 people on GitHub issues.
Critical work in pandas is fragile and manual
4 posts from 4 people on GitHub issues.
pandas builds are slow or flaky
4 posts from 1 person on GitHub issues. Unverified.
Trouble with pandas dtype
Top post: "pd.to_numeric with errors=coerce fails to produce actual NA values when applied to dtype string[pyarrow]", one of 3 posts from 3 people on GitHub issues.
History