specify utf8 when calling io.open

IPython/core/magic.py

@@ -2230,7 +2230,7 Currently the magic system has the following functions:\n"""
         except (TypeError, ValueError) as e:
             print e.args[0]
             return
-        with py3compat.open(fname,'w', encoding="utf-8") as f:
+        with io.open(fname,'w', encoding="utf-8") as f:
             f.write(u"# coding: utf-8\n")
             f.write(py3compat.cast_unicode(cmds))
         print 'The following commands were written to file `%s`:' % fname
@@ -3683,7 +3683,7 Defaulting color scheme to 'NoColor'"""
                 cells.append(current.new_code_cell(prompt_number=prompt_number, input=input))
             worksheet = current.new_worksheet(cells=cells)
             nb = current.new_notebook(name=name,worksheets=[worksheet])
-            with io.open(fname, 'w') as f:
+            with io.open(fname, 'w', encoding='utf-8') as f:
                 current.write(nb, f, format);
         elif args.format is not None:
             old_fname, old_name, old_format = current.parse_filename(args.filename)
@@ -3697,9 +3697,9 Defaulting color scheme to 'NoColor'"""
                 new_fname = old_name + u'.py'
             else:
                 raise ValueError('Invalid notebook format: %s' % new_format)
-            with io.open(old_fname, 'r') as f:
+            with io.open(old_fname, 'r', encoding='utf-8') as f:
                 nb = current.read(f, old_format)
-            with io.open(new_fname, 'w') as f:
+            with io.open(new_fname, 'w', encoding='utf-8') as f:
                 current.write(nb, f, new_format)
 
     def magic_config(self, s):

IPython/nbformat/v3/tests/formattest.py

@@ -17,6 +17,9 from ..nbpy import reads, writes, read, write
 from .nbexamples import nb0, nb0_py
 
 
+def open_utf8(fname, mode):
+    return io.open(fname, mode=mode, encoding='utf-8')
+
 class NBFormatTestCase(TestCase):
 
     # override with appropriate values in subclasses
@@ -47,14 +50,14 class NBFormatTestCase(TestCase):
         self.assertNBEquals(self.mod.reads(s),nb0)
 
     def test_write_file(self):
-        with io.open(pjoin(self.wd, "nb0.%s" % self.ext), 'w') as f:
+        with open_utf8(pjoin(self.wd, "nb0.%s" % self.ext), 'w') as f:
             self.mod.write(nb0, f)
     
     def test_read_file(self):
-        with io.open(pjoin(self.wd, "nb0.%s" % self.ext), 'w') as f:
+        with open_utf8(pjoin(self.wd, "nb0.%s" % self.ext), 'w') as f:
             self.mod.write(nb0, f)
         
-        with io.open(pjoin(self.wd, "nb0.%s" % self.ext), 'r') as f:
+        with open_utf8(pjoin(self.wd, "nb0.%s" % self.ext), 'r') as f:
             nb = self.mod.read(f)