Use unicode_std_stream in nbconvert stdout writer

Closes gh-4578

IPython/nbconvert/writers/stdout.py

@@ -1,34 +1,34 b''
 """
 Contains Stdout writer
 """
 #-----------------------------------------------------------------------------
 #Copyright (c) 2013, the IPython Development Team.
 #
 #Distributed under the terms of the Modified BSD License.
 #
 #The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
+from IPython.utils import io
 from .base import WriterBase
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 class StdoutWriter(WriterBase):
     """Consumes output from nbconvert export...() methods and writes to the 
     stdout stream."""
 
 
     def write(self, output, resources, **kw):
         """
         Consume and write Jinja output.
 
         See base for more...
         """
-
-        print(output)
+        io.unicode_std_stream().write(output)

IPython/nbconvert/writers/tests/test_stdout.py

@@ -1,51 +1,54 b''
+# coding: utf-8
 """
 Module with tests for stdout
 """
 
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import sys
 
 from ...tests.base import TestsBase
 from ..stdout import StdoutWriter
 from IPython.utils.py3compat import PY3
 
 if PY3:
     from io import StringIO
 else:
     from StringIO import StringIO
 
 
 #-----------------------------------------------------------------------------
 # Class
 #-----------------------------------------------------------------------------
 
 class TestStdout(TestsBase):
     """Contains test functions for stdout.py"""
 
     def test_output(self):
         """Test stdout writer output."""
         
         # Capture the stdout.  Remember original.
         stdout = sys.stdout
         stream = StringIO()
         sys.stdout = stream
 
         # Create stdout writer, test output
         writer = StdoutWriter()
-        writer.write('a', {'b': 'c'})
+        writer.write(u'a×', {'b': 'c'})
         output = stream.getvalue()
-        self.fuzzy_compare(output, 'a')
+        if not PY3:
+            output = output.decode('utf-8')
+        self.fuzzy_compare(output, u'a×')
 
         # Revert stdout
         sys.stdout = stdout
  No newline at end of file