Fix Builder App setup (pin Python version and run uvicorn via uv)#208
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balazsgaspar wants to merge 2 commits intodatabricks-solutions:mainfrom
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Fix Builder App setup (pin Python version and run uvicorn via uv)#208balazsgaspar wants to merge 2 commits intodatabricks-solutions:mainfrom
balazsgaspar wants to merge 2 commits intodatabricks-solutions:mainfrom
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- Set requires-python = ">=3.11,<3.14" so uv uses a version with pre-built pyarrow wheels (avoids source build and CMake dependency) - Add .python-version pin to 3.12 for consistent local and CI installs Fixes databricks-solutions#117
uvicorn is installed in the project venv by uv sync. Running it via uv run ensures the script finds it without activating the venv.
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Summary
Fixes #117. The Databricks Builder App out-of-the-box setup was failing when using Python 3.14 as
pyarrow==18.1.0has no pre-built wheel for 3.14, souv synctried to build it from source and failed (e.g. missing CMake). Additionally,start_dev.shcould fail with "uvicorn: command not found" when the project venv was not activated.Changes
Python constraint (pyarrow / Databricks Visual App Builder install failed #117)
requires-python = ">=3.11,<3.14"indatabricks-builder-app/pyproject.tomlso installs use a Python version that has pyarrow wheels (3.11–3.13), avoiding source build and CMake.databricks-builder-app/.python-versionwith3.12souvuses 3.12 by default in this app.start_dev.sh
uv run uvicorn ...so the script uses the project venv and finds uvicorn without requiring an activated environment.Testing
./scripts/setup.shindatabricks-builder-appon macOS (arm64). Backend and frontend dependencies were installed successfully../scripts/start_dev.sh; backend and frontend started without "uvicorn: command not found".