init_dev-70: Just merged the hot_test7. opt3 of "Ask file by file" is almost finished, but now i have to deal with the dict and sub-dict problem.
hot_test8_1: Add logical statment in the for-loop of dict in handle_preexist.py : if there is no element in dict, jump out of the loop. Finish opt3 in "Ask file by file" section.