how to get the subject of email?

[luofeiyu]

I am in python3.4

typ, data = x.con.fetch(b'1', '(RFC822)')   #get  the first email
text = data[0][1]
message = email.message_from_string(text).get('subject')

Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "D:\Python34\lib\email\__init__.py", line 40, in message_from_string
     return Parser(*args, **kws).parsestr(s)
   File "D:\Python34\lib\email\parser.py", line 70, in parsestr
     return self.parse(StringIO(text), headersonly=headersonly)
TypeError: initial_value must be str or None, not bytes

message = email.message_from_string(str(text)).get('subject')
message  # nothing displayed