Add calculator with basic arithmetic operations

- Implement add, subtract, multiply, divide functions
- Handle division by zero with proper exception
- Include comprehensive test suite
- Use ASCII characters for cross-platform compatibility

.gitignore

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+.claude/
+hlm_2/
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.Python
+env/
+venv/
+*.egg-info/
+dist/
+build/
+.DS_Store

py_match.py

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+#!/usr/bin/env python3
+"""
+Simple calculator with basic arithmetic operations.
+Handles division by zero and provides simple testing.
+"""
+
+def add(a: float, b: float) -> float:
+    """Return the sum of a and b."""
+    return a + b
+
+def subtract(a: float, b: float) -> float:
+    """Return a minus b."""
+    return a - b
+
+def multiply(a: float, b: float) -> float:
+    """Return a multiplied by b."""
+    return a * b
+
+def divide(a: float, b: float) -> float:
+    """
+    Return a divided by b.
+
+    Raises:
+        ZeroDivisionError: if b is 0
+    """
+    if b == 0:
+        raise ZeroDivisionError("Cannot divide by zero")
+    return a / b
+
+def test_calculator():
+    """Test all calculator functions."""
+    print("Testing calculator functions...")
+
+    # Test addition
+    result = add(5, 3)
+    expected = 8
+    assert result == expected, f"Addition failed: {result} != {expected}"
+    print(f"[OK] add(5, 3) = {result}")
+
+    # Test subtraction
+    result = subtract(10, 4)
+    expected = 6
+    assert result == expected, f"Subtraction failed: {result} != {expected}"
+    print(f"[OK] subtract(10, 4) = {result}")
+
+    # Test multiplication
+    result = multiply(7, 6)
+    expected = 42
+    assert result == expected, f"Multiplication failed: {result} != {expected}"
+    print(f"[OK] multiply(7, 6) = {result}")
+
+    # Test division
+    result = divide(15, 3)
+    expected = 5
+    assert result == expected, f"Division failed: {result} != {expected}"
+    print(f"[OK] divide(15, 3) = {result}")
+
+    # Test division by zero
+    try:
+        divide(10, 0)
+        print("[ERROR] Division by zero should have raised an error")
+        return False
+    except ZeroDivisionError as e:
+        print(f"[OK] divide(10, 0) raised: {e}")
+
+    # Test with floats
+    result = add(2.5, 3.7)
+    expected = 6.2
+    assert abs(result - expected) < 0.0001, f"Float addition failed: {result} != {expected}"
+    print(f"[OK] add(2.5, 3.7) = {result}")
+
+    print("\n[PASSED] All tests passed!")
+    return True
+
+def main():
+    """Main function to demonstrate calculator usage."""
+    print("Calculator Demo")
+    print("-" * 50)
+
+    # Demonstrate basic operations
+    a, b = 20, 5
+
+    print(f"a = {a}, b = {b}")
+    print(f"a + b = {add(a, b)}")
+    print(f"a - b = {subtract(a, b)}")
+    print(f"a * b = {multiply(a, b)}")
+    print(f"a / b = {divide(a, b)}")
+
+    print("\n" + "-" * 50)
+
+    # Show division by zero handling
+    print("Testing division by zero protection:")
+    try:
+        result = divide(a, 0)
+    except ZeroDivisionError as e:
+        print(f"Caught expected error: {e}")
+
+if __name__ == "__main__":
+    # Run tests first
+    if test_calculator():
+        print("\n" + "=" * 50)
+        main()