python3 学习

file_name = input("输入备份的文件： ")
postion = file_name.rfind(".")
file_name_new = file_name[:postion] + "[附件]" + file_name[postion:]

f1 = open(file_name,‘r‘,encoding="UTF-8")

f2 = open(file_name_new,"w",encoding="UTF-8")
while True:
    content = f1.read(1024)
    if len(content) == 0:
        break
    f2.write(content)

f1.close()
f2.close()