Issue on Python 3.6

Code works perfectly on Python 2.7, but in Python 3.6 crashes the first time Screen.refresh() is called.

Traceback (most recent call last):
  File "/Users/anthonyshaw/repo/retox-2/retox/__main__.py", line 66, in main
    screen.refresh()
  File "/Users/anthonyshaw/repo/retox-2/src/asciimatics/asciimatics/screen.py", line 2129, in refresh
    super(_CursesScreen, self).refresh()
  File "/Users/anthonyshaw/repo/retox-2/src/asciimatics/asciimatics/screen.py", line 1216, in refresh
    self._change_colours(new_cell[1], new_cell[2], new_cell[3])
  File "/Users/anthonyshaw/repo/retox-2/src/asciimatics/asciimatics/screen.py", line 2225, in _change_colours
    self._safe_write(self._a_normal)
  File "/Users/anthonyshaw/repo/retox-2/src/asciimatics/asciimatics/screen.py", line 2085, in _safe_write
    sys.stdout.write(msg)
  File "/Users/anthonyshaw/repo/retox-2/bin/../lib/python3.6/codecs.py", line 377, in write
    self.stream.write(data)
  File "/Users/anthonyshaw/repo/retox-2/bin/../lib/python3.6/codecs.py", line 376, in write
    data, consumed = self.encode(object, self.errors)
TypeError: utf_8_encode() argument 1 must be str, not bytes

Any help/tips on debugging would be appreciated.

[peterbrittain]

Yeah - it’s doing its best to scuttle away and hide!

[peterbrittain]

Note that the problem is that tox is setting up UTF-8 StreamWriter around a UTF-8 TextIOWrapper. Getting access to the underlying BufferedWriter instead would fix the issue. For example:

sys.stdout = codecs.getwriter('utf8')(sys.stdout.buffer)