Add UV demo

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "pip"
+    directory: "/pkg"
+    schedule:
+      interval: "daily"
+    groups:
+      patches:
+        update-types:
+        - "minor"
+        - "patch"
+    open-pull-requests-limit: 100

.github/workflows/push.yml

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+name: On Push Workflow
+
+on:
+  push:
+
+jobs:
+  uv-sync:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 2
+
+    - name: UV sync
+      id: uv-sync
+      # a new commit will not trigger this workflow again
+      run: |
+        pipx install uv
+        ./bin/uv-sync.sh
+
+  build:
+    runs-on: ubuntu-latest
+    needs: uv-sync
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install UV
+        run: |
+          pipx install uv
+
+      - name: Run tests
+        run: |
+          uv run pytest tests

.gitignore

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+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv
+.vscode

.python-version

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+3.12

bin/uv-sync.sh

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+#!/usr/bin/env bash
+set -e
+
+PYTHON_VERSION=$(cat .python-version)
+BRANCH_NAME=${GITHUB_REF#refs/heads/}
+AUTHOR_NAME=$(git log -1 --pretty=format:"%an")
+AUTHOR_EMAIL=$(git log -1 --pretty=format:"%ae")
+
+if [[ "$AUTHOR" == *dependabot* ]] ; then
+    # Read requirements.txt, exclude comments, and format as TOML array
+    constraints=$(grep -vE '^\s*#' requirements.txt | awk '{print "  \""$0"\","}')
+
+    # Append constraint-dependencies to pyproject.toml
+    cat << EOF >> pyproject.toml
+
+[tool.uv]
+constraint-dependencies = [
+$constraints
+]
+EOF
+
+    echo "Lock uv with a new requirements.txt as constraint"
+    uv lock
+fi
+
+echo "Export uv.lock to requirements.txt"
+uv export --no-hashes -o requirements.txt
+
+# Add pip-compile like comment to the top of requirements.txt
+# for dependabot to detect a pip-compile workflow
+cat << EOF | cat - requirements.txt > temp && mv temp requirements.txt
+#
+# This file is autogenerated by pip-compile with Python $PYTHON_VERSION
+# by the following command:
+#
+#    pip-compile pyproject.toml
+#
+#
+# The above comment was added for dependabot to support uv.
+#
+EOF
+
+git add uv.lock requirements.txt
+if ! git diff --cached --quiet; then
+    git config --global user.name "$AUTHOR_NAME"
+    git config --global user.email "$AUTHOR_EMAIL"
+    git commit -m "Sync uv.lock and requirements.txt"
+    git push origin $BRANCH_NAME
+fi

main.py

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+from uv_light.lens import Lens
+from uv_light.beam import Beam
+
+if __name__ == "main":
+    print(Beam().project_on(Lens()))

pyproject.toml

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+[project]
+name = "uv-light"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "flask==3.*",
+    "pandas==2.*",
+    "pyarrow==17.*",
+    "pytest>=8.3.3",
+]

tests/uv_light/test_beam.py

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+from uv_light.beam import Beam
+from uv_light.lens import Lens
+
+def test_beam_project_on():
+    actual = Beam().project_on(Lens())
+    expected = "~~~|--->\n~~~|--->\n~~~|--->\n~~~|--->"
+    assert actual == expected

uv_light/beam.py

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+import pandas as pd
+import pyarrow as pa
+
+class Beam:
+    def __init__(self):
+        # Represent the beam with an arrow
+        self.beam_pattern = pa.array(["--->", "--->", "--->", "--->"])
+
+    def project_on(self, lens):
+        # Convert pyarrow array to pandas DataFrame
+        beam_frame = pd.DataFrame({'Beam': self.beam_pattern.to_pandas()})
+        return lens.focus_beam(beam_frame)

uv_light/lens.py

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+import pandas as pd
+
+class Lens:
+    def focus_beam(self, beam_frame):
+        # Add lens symbol to the DataFrame
+        beam_frame['Lens'] = '~~~|'
+        # Combine Beam and Lens columns into a single string representation
+        beam_frame['Projection'] = beam_frame['Lens'] + beam_frame['Beam']
+        return beam_frame['Projection'].to_string(index=False, header=False)