File size: 792 Bytes
a521353 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | import ast, operator as op
_OPS = {ast.Add: op.add, ast.Sub: op.sub, ast.Mult: op.mul, ast.Div: op.truediv,
ast.Pow: op.pow, ast.USub: op.neg, ast.Mod: op.mod}
def _ev(node):
if isinstance(node, ast.Num): return node.n
if isinstance(node, ast.Constant): return node.value
if isinstance(node, ast.BinOp): return _OPS[type(node.op)](_ev(node.left), _ev(node.right))
if isinstance(node, ast.UnaryOp): return _OPS[type(node.op)](_ev(node.operand))
raise ValueError("unsafe expression")
def run(params: dict) -> dict:
expr = params.get("expression", "")
try:
return {"result": _ev(ast.parse(expr, mode="eval").body), "expression": expr}
except Exception as e:
return {"error": str(e), "expression": expr}
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