Method pop

recipes/Python/59884_RPN_Stack_class/recipe-59884.py:42–51

(self, num_of_loops=1)

                self.stack = [item] + self.stack

        def pop(self, num_of_loops=1):
                x=[]
                curr_loop=0
                while curr_loop < num_of_loops:
                        try:
                                x, self.stack = x + [self.stack[0]], self.stack[1:]
                        except:
                                pass #return "error:  stack underflow"
                        curr_loop += 1
                return tuple(x)

        def empty(self):  #returns true if stack is empty
                return not self.stack