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Reported by Serhiy in issue 16564:
>>> import io, email
>>> bytesdata = b'\xfa\xfb\xfc\xfd\xfe\xff'
>>> msg = email.mime.application.MIMEApplication(bytesdata, _encoder=encoders.encode_7or8bit)
>>> s = io.BytesIO()
>>> g = email.generator.BytesGenerator(s)
>>> g.flatten(msg)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/serhiy/py/cpython3.2/Lib/email/generator.py", line 91, in flatten
 self._write(msg)
 File "/home/serhiy/py/cpython3.2/Lib/email/generator.py", line 137, in _write
 self._dispatch(msg)
 File "/home/serhiy/py/cpython3.2/Lib/email/generator.py", line 163, in _dispatch
 meth(msg)
 File "/home/serhiy/py/cpython3.2/Lib/email/generator.py", line 393, in _handle_text
 if _has_surrogates(msg._payload):
TypeError: can't use a string pattern on a bytes-like object

New changeset f83581135ec4 by R David Murray in branch '3.2':
#17171: fix email.encoders.encode_7or8bit when applied to binary data.
http://hg.python.org/cpython/rev/f83581135ec4
New changeset cabcddbed377 by R David Murray in branch '3.3':
Merge: #17171: fix email.encoders.encode_7or8bit when applied to binary data.
http://hg.python.org/cpython/rev/cabcddbed377
New changeset a80b67611c6d by R David Murray in branch 'default':
Merge: #17171: fix email.encoders.encode_7or8bit when applied to binary data.
http://hg.python.org/cpython/rev/a80b67611c6d
New changeset e44fa71d76fe by R David Murray in branch '2.7':
#17171: backport behavior-confirming test from python3.
http://hg.python.org/cpython/rev/e44fa71d76fe 

Since this was straightforwardly similar to the issue 16564 fix I didn't bother with a review. The 2.7 commit is backporting the behavior-confirming test, just for thoroughness.