use bytes throughout telnetlib docs

Doc/library/telnetlib.rst

@@ -62,58 +62,58 @@ Telnet Objects
 
 .. method:: Telnet.read_until(expected[, timeout])
 
-   Read until a given string, *expected*, is encountered or until *timeout* seconds
-   have passed.
+   Read until a given byte string, *expected*, is encountered or until *timeout*
+   seconds have passed.
 
-   When no match is found, return whatever is available instead, possibly the empty
-   string.  Raise :exc:`EOFError` if the connection is closed and no cooked data is
-   available.
+   When no match is found, return whatever is available instead, possibly empty
+   bytes.  Raise :exc:`EOFError` if the connection is closed and no cooked data
+   is available.
 
 
 .. method:: Telnet.read_all()
 
-   Read all data until EOF; block until connection closed.
+   Read all data until EOF as bytes; block until connection closed.
 
 
 .. method:: Telnet.read_some()
 
-   Read at least one byte of cooked data unless EOF is hit. Return ``''`` if EOF is
-   hit.  Block if no data is immediately available.
+   Read at least one byte of cooked data unless EOF is hit. Return ``b''`` if
+   EOF is hit.  Block if no data is immediately available.
 
 
 .. method:: Telnet.read_very_eager()
 
    Read everything that can be without blocking in I/O (eager).
 
-   Raise :exc:`EOFError` if connection closed and no cooked data available.  Return
-   ``''`` if no cooked data available otherwise. Do not block unless in the midst
-   of an IAC sequence.
+   Raise :exc:`EOFError` if connection closed and no cooked data available.
+   Return ``b''`` if no cooked data available otherwise. Do not block unless in
+   the midst of an IAC sequence.
 
 
 .. method:: Telnet.read_eager()
 
    Read readily available data.
 
-   Raise :exc:`EOFError` if connection closed and no cooked data available.  Return
-   ``''`` if no cooked data available otherwise. Do not block unless in the midst
-   of an IAC sequence.
+   Raise :exc:`EOFError` if connection closed and no cooked data available.
+   Return ``b''`` if no cooked data available otherwise. Do not block unless in
+   the midst of an IAC sequence.
 
 
 .. method:: Telnet.read_lazy()
 
    Process and return data already in the queues (lazy).
 
-   Raise :exc:`EOFError` if connection closed and no data available. Return ``''``
-   if no cooked data available otherwise.  Do not block unless in the midst of an
-   IAC sequence.
+   Raise :exc:`EOFError` if connection closed and no data available. Return
+   ``b''`` if no cooked data available otherwise.  Do not block unless in the
+   midst of an IAC sequence.
 
 
 .. method:: Telnet.read_very_lazy()
 
    Return any data available in the cooked queue (very lazy).
 
-   Raise :exc:`EOFError` if connection closed and no data available. Return ``''``
-   if no cooked data available otherwise.  This method never blocks.
+   Raise :exc:`EOFError` if connection closed and no data available. Return
+   ``b''`` if no cooked data available otherwise.  This method never blocks.
 
 
 .. method:: Telnet.read_sb_data()
@@ -163,9 +163,9 @@ Telnet Objects
 
 .. method:: Telnet.write(buffer)
 
-   Write a string to the socket, doubling any IAC characters. This can block if the
-   connection is blocked.  May raise :exc:`socket.error` if the connection is
-   closed.
+   Write a byte string to the socket, doubling any IAC characters. This can
+   block if the connection is blocked.  May raise :exc:`socket.error` if the
+   connection is closed.
 
 
 .. method:: Telnet.interact()
@@ -183,20 +183,21 @@ Telnet Objects
    Read until one from a list of a regular expressions matches.
 
    The first argument is a list of regular expressions, either compiled
-   (:class:`re.RegexObject` instances) or uncompiled (strings). The optional second
-   argument is a timeout, in seconds; the default is to block indefinitely.
+   (:class:`re.RegexObject` instances) or uncompiled (byte strings). The
+   optional second argument is a timeout, in seconds; the default is to block
+   indefinitely.
 
    Return a tuple of three items: the index in the list of the first regular
-   expression that matches; the match object returned; and the text read up till
-   and including the match.
+   expression that matches; the match object returned; and the bytes read up
+   till and including the match.
 
-   If end of file is found and no text was read, raise :exc:`EOFError`.  Otherwise,
-   when nothing matches, return ``(-1, None, text)`` where *text* is the text
-   received so far (may be the empty string if a timeout happened).
+   If end of file is found and no bytes were read, raise :exc:`EOFError`.
+   Otherwise, when nothing matches, return ``(-1, None, data)`` where *data* is
+   the bytes received so far (may be empty bytes if a timeout happened).
 
    If a regular expression ends with a greedy match (such as ``.*``) or if more
-   than one expression can match the same input, the results are indeterministic,
-   and may depend on the I/O timing.
+   than one expression can match the same input, the results are
+   indeterministic, and may depend on the I/O timing.
 
 
 .. method:: Telnet.set_option_negotiation_callback(callback)
@@ -234,5 +235,5 @@ A simple example illustrating typical use::
    tn.write(b"ls\n")
    tn.write(b"exit\n")
 
-   print(tn.read_all())
+   print(tn.read_all().decode('ascii'))