Support team,

Our Django application fails to import pandas in the default container.

The traceback always ends in a numpy ImportError (full log below).
We have tested every pandas release ≥1.0 with identical results.

Could you:

1. Confirm the base image and numpy version pre-installed in the default container.

2. Advise on any platform-specific build flags or wheels we should use.

3. Grant us temporary shell access so we can rebuild numpy against the container’s BLAS/LAPACK?

If a custom image is required, please point us to your Dockerfile template and any internal package mirrors we must use.

Thanks in advace.

Mauricio

(venv) root@0628a7e59180:/app# python -c "import pandas as pd"

Traceback (most recent call last):

File "<string>", line 1, in <module>

File "/opt/venv/lib/python3.12/site-packages/pandas/__init__.py", line 16, in <module>

raise ImportError(

ImportError: Unable to import required dependencies:

numpy: Error importing numpy: you should not try to import numpy from

its source directory; please exit the numpy source tree, and relaunch

your python interpreter from there.

Build log:
==============

Using Nixpacks

==============

context: js2r-haIw

╔══════════════════════════════ Nixpacks v1.38.0 ══════════════════════════════╗

║ setup │ python3, postgresql_16.dev, gcc ║

║──────────────────────────────────────────────────────────────────────────────║

║ install │ python -m venv --copies /opt/venv && . /opt/venv/bin/activate ║

║ │ && pip install -r requirements.txt ║

║──────────────────────────────────────────────────────────────────────────────║

║ start │ python manage.py collectstatic --noinput && python manage.py ║

║ │ migrate && gunicorn hys.wsgi --bind 0.0.0.0:$PORT ║

╚══════════════════════════════════════════════════════════════════════════════╝

internal

load build definition from Dockerfile

0ms

internal

load metadata for ghcr.io/railwayapp/nixpacks:ubuntu-1745885067

513ms

internal

load .dockerignore

0ms

stage-0

FROM ghcr.io/railwayapp/nixpacks:ubuntu-1745885067@sha256:d45c89d80e13d7ad0fd555b5130f22a866d9dd10e861f589932303ef2314c7de

999ms

internal

load build context

0ms

stage-0

RUN nix-env -if .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix && nix-collect-garbage -d cached

0ms

stage-0

COPY .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix cached

0ms

stage-0

WORKDIR /app/ cached

0ms

stage-0

COPY . /app/.

2s

stage-0

RUN python -m venv --copies /opt/venv && . /opt/venv/bin/activate && pip install -r requirements.txt

57s

Successfully installed Django-4.2.17 Pygments-2.18.0 amqp-5.3.1 asgiref-3.8.1 asttokens-3.0.0 backcall-0.2.0 beautifulsoup4-4.12.3 billiard-4.2.1 celery-5.4.0 certifi-2024.8.30 chardet-5.2.0 charset-normalizer-3.4.0 click-8.1.8 click-didyoumean-0.3.1 click-plugins-1.1.1 click-repl-0.3.0 crispy-bootstrap5-2023.10 decorator-5.1.1 dj-database-url-2.1.0 django-appconf-1.0.6 django-autocomplete-light-3.9.7 django-bootstrap-v5-1.0.11 django-celery-results-2.5.1 django-ckeditor-6.2.0 django-colorfield-0.11.0 django-crispy-forms-2.1 django-debug-toolbar-4.4.6 django-extensions-3.2.3 django-filter-24.3 django-fontawesome-5-1.0.18 django-js-asset-2.2.0 django-pivot-1.10.0 django-select2-8.1.2 djangorestframework-3.14.0 executing-2.1.0 gunicorn-23.0.0 idna-3.10 iniconfig-2.0.0 ipython-8.12.3 jedi-0.19.2 kombu-5.4.2 matplotlib-inline-0.1.7 networkx-3.4.2 numpy-2.3.3 packaging-24.2 pandas-2.2.3 parso-0.8.4 pexpect-4.9.0 pickleshare-0.7.5 pillow-11.0.0 pluggy-1.5.0 prompt_toolkit-3.0.48 psutil-7.0.0 psycopg2-binary-2.9.10 ptyprocess-0.7.0 pure_eval-0.2.3 pytest-8.3.4 python-dateutil-2.8.2 python-dotenv-1.0.1 pytz-2024.2 redis-5.2.1 reportlab-4.2.2 requests-2.32.3 six-1.17.0 soupsieve-2.6 sqlparse-0.5.3 stack-data-0.6.3 traitlets-5.14.3 typing_extensions-4.12.2 tzdata-2024.2 urllib3-2.2.3 vine-5.1.0 wcwidth-0.2.13 whitenoise-6.6.0

stage-0

RUN printf '\nPATH=/opt/venv/bin:$PATH' >> /root/.profile

27s

stage-0

COPY . /app

42ms

auth

sharing credentials for production-us-east4-eqdc4a.railway-registry.com

0ms

=== Successfully Built! ===

Run:

docker run -it production-us-east4-eqdc4a.railway-registry.com/d8df5d99-5bfb-474c-b8af-ed5390cb4666:82911456-2d22-453c-a1ba-a2d527f72a0b

Build time: 115.39 seconds

Deploy log:
Starting Container

125 static files copied to '/app/static'.

Operations to perform:

Apply all migrations: admin, auth, contenttypes, sessions

Running migrations:

No migrations to apply.

[2025-09-18 18:48:47 +0000] [1] [INFO] Starting gunicorn 23.0.0

[2025-09-18 18:48:47 +0000] [1] [INFO] Listening at: http://0.0.0.0:8080 (1)

[2025-09-18 18:48:47 +0000] [1] [INFO] Using worker: sync

[2025-09-18 18:48:47 +0000] [6] [INFO] Booting worker with pid: 6