rpn.py

stackAdd, stackSub, stackDiv, stackMult, stackExp, stackMod, stackFac, stackIntDiv, inner, evalRPN = lambda stack: stack.append(stack.pop() + stack.pop()), lambda stack: stack.append((stack.pop() - stack.pop()) * -1), \
                                                                       lambda stack: stack.append(1 / (stack.pop() / stack.pop())), lambda stack: stack.append(stack.pop() * stack.pop()), \
                                                                       lambda stack: stack.append(stack[-2] ** (stack.pop(), stack.pop())[0]), lambda stack: \
                                                                       stack.append(stack[-2] % (stack.pop(), stack.pop())[0]), \
                                                                       lambda stack: stack.append(eval(''.join([str(i) + '*' for i in range(1, int(stack.pop()) + 1)]) + '1')), \
                                                                       lambda stack: stack.append((lambda a, b: b // a)(stack.pop(), stack.pop())), \
                                                                       lambda r, operators, stack = []: \
                                                                       ([stack.append(float(i)) if i not in [j[0] for j in operators] else \
                                                                         [exec('stack' + j[1:] + '(stack)', globals(), {'stack':stack}) \
                                                                          for j in operators if i == j[0]] for i in r.split(' ')], stack[-1])[1], \
                                                                       lambda r, operators = ['+Add', '-Sub', '/Div', '&IntDiv', '*Mult', '^Exp', '%Mod', '!Fac']: inner(r.replace('//', '&'), operators)
print(evalRPN('0.5 1 2 ! * 2 1 ^ + 10 + *'))
print(evalRPN('1 2 3 4 ! + - / 100 *'))