Image reports error ModuleNotFoundError: No module named '_bz2' when importing pandas

[yuhuishi-convect]

Expected Behavior

pandas is imported without error.

Current Behavior

Error message

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/__init__.py", line 48, in <module>
    from pandas.core.api import (
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/core/api.py", line 47, in <module>
    from pandas.core.groupby import (
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/core/groupby/__init__.py", line 1, in <module>
    from pandas.core.groupby.generic import (
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/core/groupby/generic.py", line 76, in <module>
    from pandas.core.frame import DataFrame
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/core/frame.py", line 170, in <module>
    from pandas.core.generic import NDFrame
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/core/generic.py", line 147, in <module>
    from pandas.core.describe import describe_ndframe
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/core/describe.py", line 45, in <module>
    from pandas.io.formats.format import format_percentiles
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/io/formats/format.py", line 105, in <module>
    from pandas.io.common import (
  File "/layers/paketo-buildpacks_poetry-install/poetry-venv/auto-timeseries-xS3fZVNL-py3.11/lib/python3.11/site-packages/pandas/io/common.py", line 8, in <module>
    import bz2
  File "/layers/paketo-buildpacks_cpython/cpython/lib/python3.11/bz2.py", line 17, in <module>
    from _bz2 import BZ2Compressor, BZ2Decompressor
ModuleNotFoundError: No module named '_bz2'

Possible Solution

Use version 2.4 of the buildpack instead of 2.5
This looks like a problem with 2.5. I can build the image with 2.4 w/o such an issue.

Steps to Reproduce

1. Clone the folder https://github.com/convect-ai/trac/tree/master/examples/time-series
2. pack build time_series_forecasting -b gcr.io/paketo-buildpacks/python:2.5 --builder docker.io/paketobuildpacks/builder:base
3. docker run --rm --entrypoint launcher time_series_forecasting poetry run python -c 'import pandas'

Motivations

[robdimsdale]

Hi @yuhuishi-convect - sorry about this.

I'm not surprised to hear this because we aren't compiling the current version of python against the bz2 library. See paketo-buildpacks/cpython#468 for more details. We wanted to see what types of apps required bz2, and so it's actually really helpful to learn that Pandas apps often use it.

I think we should support Pandas, so we'll prioritize getting this fixed.

[robdimsdale]

This should be resolved with: paketo-buildpacks/cpython#476

[robdimsdale]

I've validated that this is fixed in CPython Buildpack v1.7.3.

We'll publish a new version of Python this week with the updated component buildpack

[robdimsdale]

This should be fixed in Python Buildpack v2.6.0.

I'm going to close this, but please feel free to re-open if you continue to encounter this issue on v2.6.0

[yuhuishi-convect]

Thanks for fixing that @robdimsdale