__author__ = 'Alex'import re;str_list = []def fetch(ci,li,str):    for k in range(len(ci)-1):        if ci[k] > ci[k+1]:            print(("li[k] = %s,li[k+1] = %s")%(li[k],li[k+1]))            s = str[li[k]:li[k+1]+1]            str_list.append(s)            print (str_list)            del ci[k]            del ci[k]            del li[k]            del li[k]            return str_liststr = "1 - 2*(17-(60-30+(-40*2/5)*9-2*5/3+7/3*99/4*2998+10*568/14))-(-4*3)/(16-3*2)"count = 0i_list = []count_list = []for i in range(len(str)):    if str[i] == '(':        # print ("i= ",i)        count +=1        i_list.append(i)        count_list.append(count)        print (("i = %s ,count = %s ")%(i,count))    if str[i] == ')':        # print ("i= ",i)        count -=1        i_list.append(i)        count_list.append(count)        print (("i = %s ,count = %s ")%(i,count))print (i_list)print (count_list)while len(count_list)>0:    symbols_list = fetch(count_list,i_list,str)# print (int(symbols_list[1]))