批量子线程等待技巧

import threading
pass
thread_list = []
for line in file:
    read_list.append(line)
    if len(read_list) == 2:
        t = threading.Thread(target=sum_line_num, args=(read_list,))
        t.start()
        thread_list.append(t)
for t in thread_list:
    t.join()
print(sum(SUM_LIST))