que = Queue() stk = Stack() indx = 0 for item in inf: if item.isnumeric(): que._Push(item) elif item in ops: if ops.get(item) == 4: for i in range(stk._getLen()): que._Push(stk._Pop()) elif stk._getLast() == None: stk._Push(item) else: if ops.get(item) > ops.get(stk._getLast()): stk._Push(item) elif ops.get(item) < ops.get(stk._getLast()): for i in range(stk._getLen()): que._Push(stk._Pop()) stk._Push(item) elif ops.get(item) == ops.get(stk._getLast()): que._Push(stk._Pop()) stk._Push(item) for item in range(stk._getLen()): que._Push(stk._Pop())