Alan Franzin

@franzinbr.bsky.social

Software Engineer & Tech Lead

$def rpn(expression): stack = [] operations = { '*': lambda a, b : a * b, '/': lambda a, b : a / b, '+': lambda a, b : a + b, '-': lambda a, b : a - b, } for token in expression.split(): if is_number(token): stack.append(float(token)) continue op = operations.get(token) if op is None: raise ValueError(f"{expression} => >>{token}<< is a invalid operator") last_item = stack.pop() penultimate_item = stack.pop() result = op(penultimate_item, last_item) stack.append(result) return stack[0] def is_number(value): try: float(value) return True except ValueError: return False$