export file name is idential to the script name currently. e.g.: script name = "test.txt", then the export file name = "test.csv", if more than 1 time exported, then it would be "test (1).csv", "test (2).csv"(if set to be in the same directory folder).
it's obscure to see the difference between each export file(from time to time, or several days later).
the export file name is expected to be explicit:
all in all, the purpose here is recognise the files easily and increase the efficiency.