I have no knowledge of pyreadline - I produced the fix based on other PRs and some superificial study to fix the remaining bugs.

To reproduce the problems, just pip install pyreadline and then lanuch python; you should received:

@cygwin:~$pip install pyreadline
Collecting pyreadline
Installing collected packages: pyreadline
Successfully installed pyreadline-2.1
@cygwin:~$python
Python 3.6.1 (v3.6.1:69c0db5, Mar 21 2017, 18:41:36) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
Failed calling sys.__interactivehook__
Traceback (most recent call last):
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site.py", line 418, in register_readline
    readline.read_history_file(history)
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\rlmain.py", line 165, in read_history_file
    self.mode._history.read_history_file(filename)
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\lineeditor\history.py", line 82, in read_history_file
    for line in open(filename, 'r'):
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x8f in position 2581: character maps to <undefined>
>>>

Pressing [Tab] you will receive:

>>> Readline internal error
Traceback (most recent call last):
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\console\console.py", line 768, in hook_wrapper_23
    res = ensure_str(readline_hook(prompt))
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\rlmain.py", line 571, in readline
    self._readline_from_keyboard()
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\rlmain.py", line 536, in _readline_from_keyboard
    if self._readline_from_keyboard_poll():
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\rlmain.py", line 556, in _readline_from_keyboard_poll
    result = self.mode.process_keyevent(event.keyinfo)
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\modes\emacs.py", line 243, in process_keyevent
    r = self.process_keyevent_queue[-1](keyinfo)
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\modes\emacs.py", line 286, in _process_keyevent
    r = dispatch_func(keyinfo)
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\modes\basemode.py", line 257, in complete
    completions = self._get_completions()
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\site-packages\pyreadline\modes\basemode.py", line 200, in _get_completions
    r = self.completer(ensure_unicode(text), i)
  File "D:\Apps\WinPython-64bit-3.6.1.0Qt5\python-3.6.1.amd64\lib\rlcompleter.py", line 80, in complete
    readline.redisplay()
AttributeError: module 'readline' has no attribute 'redisplay'
>>>

pyreadline workaround for... don't remember what #544

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