Added some features

.github/workflows/python-app.yml

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+name: Python application
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.11", "3.12"]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+
+      - name: Test with Pytest
+        run: |
+          pytest
+
+      - name: Lint with Pylint
+        run: |
+          pylint ./utils.py
+
+      - name: Format with Black
+        run: |
+          black --check .

test_utils.py

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+# Exemplary calculator tests
+
+import pytest
+import utils
+
+
+@pytest.mark.parametrize("a, b, expected", [(1, 2, 3), (2, 3, 5), (3, 4, 7), (4, 5, 9)])
+def test_add(a, b, expected):
+    result = utils.add(a, b)
+    assert result == expected
+
+
+@pytest.mark.parametrize(
+    "a, b, expected", [(1, 2, -1), (2, 3, -1), (3, 4, -1), (4, 5, -1)]
+)
+def test_subtract(a, b, expected):
+    result = utils.subtract(a, b)
+    assert result == expected
+
+
+@pytest.mark.parametrize(
+    "a, b, expected", [(1, 2, 2), (2, 3, 6), (3, 4, 12), (4, 5, 20)]
+)
+def test_multiply(a, b, expected):
+    result = utils.multiply(a, b)
+    assert result == expected
+
+
+@pytest.mark.parametrize("a, b, expected", [(1, 2, 0.5), (3, 4, 0.75), (4, 5, 0.8)])
+def test_divide(a, b, expected):
+    result = utils.divide(a, b)
+    assert result == expected

utils.py

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+"""Exemplary calculator functions module.
+Provides basic arithmetic operations: add, subtract, multiply, divide.
+"""
+
+
+def add(a: int, b: int) -> int:
+    """Add two integers and return the result."""
+    return a + b
+
+
+def subtract(a: int, b: int) -> int:
+    """Subtract the second integer from the first and return the result."""
+    return a - b
+
+
+def multiply(a: int, b: int) -> int:
+    """Multiply two integers and return the result."""
+    return a * b
+
+
+def divide(a: int, b: int) -> float:
+    """Divide the first integer by the second and return the result as a float."""
+    return a / b