Don't use nbformat.current in core

IPython/core/interactiveshell.py

@@ -2649,9 +2649,9 b' class InteractiveShell(SingletonConfigurable):'
         def get_cells():
             """generator for sequence of code blocks to run"""
             if fname.endswith('.ipynb'):
-                from IPython.nbformat import current
-                with open(fname) as f:
-                    nb = current.read(f)
+                from IPython.nbformat import read
+                with io_open(fname) as f:
+                    nb = read(f, as_version=4)
                     if not nb.cells:
                         return
                     for cell in nb.cells:

IPython/core/magics/basic.py

@@ -596,14 +596,16 b' Defaulting color scheme to \'NoColor\'"""'
         """
         args = magic_arguments.parse_argstring(self.notebook, s)
 
-        from IPython.nbformat import current
+        from IPython.nbformat import write, v4
         args.filename = unquote_filename(args.filename)
         if args.export:
             cells = []
             hist = list(self.shell.history_manager.get_range())
-            for session, prompt_number, input in hist[:-1]:
-                cells.append(current.new_code_cell(prompt_number=prompt_number,
-                                                   input=input))
-            nb = current.new_notebook(cells=cells)
+            for session, execution_count, input in hist[:-1]:
+                cells.append(v4.new_code_cell(
+                    execution_count=execution_count,
+                    source=source
+                ))
+            nb = v4.new_notebook(cells=cells)
             with io.open(args.filename, 'w', encoding='utf-8') as f:
-                current.write(nb, f)
+                write(f, nb, version=4)

IPython/core/tests/test_magic.py

@@ -5,10 +5,6 b' Needs to be run by nose (to make ipython session available).'
 """
 from __future__ import absolute_import
 
-#-----------------------------------------------------------------------------
-# Imports
-#-----------------------------------------------------------------------------
-
 import io
 import os
 import sys
@@ -40,9 +36,6 b' if py3compat.PY3:'
 else:
     from StringIO import StringIO
 
-#-----------------------------------------------------------------------------
-# Test functions begin
-#-----------------------------------------------------------------------------
 
 @magic.magics_class
 class DummyMagics(magic.Magics): pass
@@ -624,7 +617,7 b' def test_extension():'
 
 
 # The nose skip decorator doesn't work on classes, so this uses unittest's skipIf
-@skipIf(dec.module_not_available('IPython.nbformat.current'), 'nbformat not importable')
+@skipIf(dec.module_not_available('IPython.nbformat'), 'nbformat not importable')
 class NotebookExportMagicTests(TestCase):
     def test_notebook_export_json(self):
         with TemporaryDirectory() as td:

IPython/core/tests/test_run.py

@@ -7,11 +7,12 b' will be kept in this separate file. This makes it easier to aggregate in one'
 place the tricks needed to handle it; most other magics are much easier to test
 and we do so in a common test_magic file.
 """
+
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
 from __future__ import absolute_import
 
-#-----------------------------------------------------------------------------
-# Imports
-#-----------------------------------------------------------------------------
 
 import functools
 import os
@@ -32,9 +33,6 b' from IPython.utils.io import capture_output'
 from IPython.utils.tempdir import TemporaryDirectory
 from IPython.core import debugger
 
-#-----------------------------------------------------------------------------
-# Test functions begin
-#-----------------------------------------------------------------------------
 
 def doctest_refbug():
     """Very nasty problem with references held by multiple runs of a script.
@@ -372,17 +370,17 b' tclass.py: deleting object: C-third'
         with tt.AssertNotPrints('SystemExit'):
             _ip.magic('run -e %s' % self.fname)
 
-    @dec.skip_without('IPython.nbformat.current')  # Requires jsonschema
+    @dec.skip_without('IPython.nbformat')  # Requires jsonschema
     def test_run_nb(self):
         """Test %run notebook.ipynb"""
-        from IPython.nbformat import current
-        nb = current.new_notebook(
+        from IPython.nbformat import v4, writes
+        nb = v4.new_notebook(
            cells=[
-                current.new_markdown_cell("The Ultimate Question of Everything"),
-                current.new_code_cell("answer=42")
+                v4.new_markdown_cell("The Ultimate Question of Everything"),
+                v4.new_code_cell("answer=42")
             ]
         )
-        src = current.writes(nb)
+        src = writes(nb, version=4)
         self.mktmp(src, ext='.ipynb')
         
         _ip.magic("run %s" % self.fname)

IPython/terminal/tests/test_help.py

@@ -1,23 +1,11 b''
 """Test help output of various IPython entry points"""
 
-#-----------------------------------------------------------------------------
-#  Copyright (C) 2013 The IPython Development Team
-#
-#  Distributed under the terms of the BSD License.  The full license is in
-#  the file COPYING, distributed as part of this software.
-#-----------------------------------------------------------------------------
-
-#-----------------------------------------------------------------------------
-# Imports
-#-----------------------------------------------------------------------------
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
 
 import IPython.testing.tools as tt
 from IPython.testing.decorators import skip_without
 
-#-----------------------------------------------------------------------------
-# Tests
-#-----------------------------------------------------------------------------
-
 
 def test_ipython_help():
     tt.help_all_output_test()
@@ -37,6 +25,6 b' def test_locate_help():'
 def test_locate_profile_help():
     tt.help_all_output_test("locate profile")
 
-@skip_without('IPython.nbformat.current')  # Requires jsonschema to be installed
+@skip_without('IPython.nbformat')  # Requires jsonschema to be installed
 def test_trust_help():
     tt.help_all_output_test("trust")