import os def load() :     filename = os.getcwd() + r'\fromto.txt'     if os.path.isfile(filename) :                f = open(filename)         try :             lines = f.readlines()         finally :             f.close()             return lines     else :         print('请创建fromto.txt.')         input()         exit() def display(_lines) :     linenum = 1     s = '序号 源文件 目标文件\n'     for line in _lines :         s += str(linenum) + ' ' + line         linenum += 1     return s + '\n' + r'请输入序号:' def work(s, _lines) :     cmd = r'copy /y ' + _lines[int(s)-1]     print(cmd)     os.system(cmd) if __name__ == "__main__" :     lines = load()     while True :         try :             s = input(display(lines)).strip()             if s.lower() == 'exit' :                 break             if int(s) == 0 :                 lines = load()                 print('已重新加载')                 continue             work(s, lines)         except :             input('--Error--')

d:\txt\1.txt d:\txt\2.txt d:\txt\*.txt d:\txt2\