Issue #23681: Fixed Python 2 to 3 poring bugs.

Indexing bytes retiurns an integer, not bytes.

diff --cc Lib/smtpd.py
index 33653d4fbf4ae64702a62967bdbebc920eb5a45f,1fa157ade7ccf6b88e20f745704264a4feb2783e..0fae1702a67a6a314d9e0bdf04cbb58d2c7ac3f0
--- 1/Lib/smtpd.py
--- 2/Lib/smtpd.py
+++ b/Lib/smtpd.py
@@@ -134,33 -128,14 +134,33 @@@ class SMTPChannel(asynchat.async_chat)
          self.conn = conn
          self.addr = addr
          self.data_size_limit = data_size_limit
 -        self.received_lines = []
 -        self.smtp_state = self.COMMAND
 +        self.enable_SMTPUTF8 = enable_SMTPUTF8
 +        if enable_SMTPUTF8:
 +            if decode_data:
 +                ValueError("decode_data and enable_SMTPUTF8 cannot be set to"
 +                           " True at the same time")
 +            decode_data = False
 +        if decode_data is None:
 +            warn("The decode_data default of True will change to False in 3.6;"
 +                 " specify an explicit value for this keyword",
 +                 DeprecationWarning, 2)
 +            decode_data = True
 +        self._decode_data = decode_data
 +        if decode_data:
 +            self._emptystring = ''
 +            self._linesep = '\r\n'
 +            self._dotsep = '.'
 +            self._newline = NEWLINE
 +        else:
 +            self._emptystring = b''
 +            self._linesep = b'\r\n'
-             self._dotsep = b'.'
++            self._dotsep = ord(b'.')
 +            self._newline = b'\n'
 +        self._set_rset_state()
          self.seen_greeting = ''
 -        self.mailfrom = None
 -        self.rcpttos = []
 -        self.received_data = ''
 +        self.extended_smtp = False
 +        self.command_size_limits.clear()
          self.fqdn = socket.getfqdn()
 -        self.num_bytes = 0
          try:
              self.peer = conn.getpeername()
          except OSError as err:

diff --cc Lib/test/test_buffer.py
Simple merge

diff --cc Lib/test/test_tokenize.py
Simple merge