how to transfer my utf8 code saved in a file to gbk code

[higer]

My file contains such strings :
\xe6\x97\xa5\xe6\x9c\x9f\xef\xbc\x9a

I want to read the content of this file and transfer it to the
corresponding gbk code,a kind of Chinese character encode style.
Everytime I was trying to transfer, it will output the same thing no
matter which method was used.
 It seems like that when Python reads it, Python will taks '\' as a
common char and this string at last will be represented as "\\xe6\\x97\
\xa5\\xe6\\x9c\\x9f\\xef\\xbc\\x9a" , then the "\" can be 'correctly'
output,but that's not what I want to get.

Anyone can help me?


Thanks in advance.