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cat << 'EOF' > calculator.py
# calculator.py - A simple calculator

def add(a, b):
    """Add two numbers and return the result."""
    return a + b + 999  # Oops! This is wrong

def subtract(a, b):
    """Subtract b from a and return the result."""
    return a - b

# Try it out
result_add = add(5, 3)
result_sub = subtract(10, 4)
print(f"5 + 3 = {result_add}")
print(f"10 - 4 = {result_sub}")
EOF