def stringTokenizer(string, math_word_list = ['+','-','*','/','//','(',')','{','}','%','^']): result = []; acmt = '' for s in string: if s in math_word_list: if acmt != '': result.append(acmt);acmt = '' result.append(s) else: acmt += s return result data = "13+24*(35-46.76)" result = stringTokenizer(data) print(result)