# Safe arithmetic using Python's eval (restricted) # In production, use a restricted environment or ast.literal_eval with operators. allowed_names = k: v for k, v in math.__dict__.items() if not k.startswith("__") allowed_names.update("abs": abs, "round": round) try: return eval(expr, {"__builtins__": {}}, allowed_names) except Exception: return "Error: invalid expression"
| Category | Examples | |----------|----------| | Arithmetic | + - * / ^ (power) | | Percentages | 15% of 200 → 30; 200 + 15% → 230 | | Aggregates | sum 5,10,15 , avg 2 4 6 , max 3 9 1 | | Unit conversions | 10 km to miles , 32 F to C | | Memory | M+ , M- , MR , MC | | Dash functions | tip 45.80 15 (tip = $6.87), split 120 4 ($30 each) | quick dash calculator
expr → term (('+' | '-') term)* term → factor (('*' | '/') factor)* factor → number | percentage | function | '(' expr ')' function → keyword '(' arguments ')' keyword → 'sum' | 'avg' | 'max' | 'min' | 'tip' | 'split' arguments → number (',' number)* percentage → number '%' ('of' number)? # Safe arithmetic using Python's eval (restricted) #
In today's fast-paced world, speed and accuracy are crucial for getting things done efficiently. When it comes to calculations, having a reliable tool that can quickly crunch numbers can be a huge time-saver. This is where the Quick Dash Calculator comes in – a powerful and user-friendly calculator designed to make calculations a breeze. When it comes to calculations, having a reliable
# Handle percentages: "15% of 200" or "200 + 15%" if '% of' in expr: parts = expr.split('% of') percent = float(parts[0]) total = float(parts[1]) return percent / 100 * total