Do not import from IPython.core.display and warn users.

IPython/core/display.py

@@ -17,16 +17,38 b' from pathlib import Path, PurePath'
 
 from IPython.utils.py3compat import cast_unicode
 from IPython.testing.skipdoctest import skip_doctest
-from .display_functions import display, clear_output, publish_display_data, update_display, DisplayHandle
+from . import display_functions
 
-__all__ = ['display', 'display_pretty', 'display_html', 'display_markdown',
+
+__all__ = ['display_pretty', 'display_html', 'display_markdown',
            'display_svg', 'display_png', 'display_jpeg', 'display_latex', 'display_json',
            'display_javascript', 'display_pdf', 'DisplayObject', 'TextDisplayObject',
            'Pretty', 'HTML', 'Markdown', 'Math', 'Latex', 'SVG', 'ProgressBar', 'JSON',
-           'GeoJSON', 'Javascript', 'Image', 'clear_output', 'set_matplotlib_formats',
-           'set_matplotlib_close', 'publish_display_data', 'update_display', 'DisplayHandle',
+           'GeoJSON', 'Javascript', 'Image', 'set_matplotlib_formats',
+           'set_matplotlib_close',
            'Video']
 
+_deprecated_names = ["display", "clear_output", "publish_display_data", "update_display", "DisplayHandle"]
+
+__all__ = __all__ + _deprecated_names
+
+
+# ----- warn to import from IPython.display -----
+
+from warnings import warn
+
+
+def __getattr__(name):
+    if name in _deprecated_names:
+        warn(f"Importing {name} from IPython.core.display is deprecated since IPython 7.14, please import from IPython display", DeprecationWarning, stacklevel=2)
+        return getattr(display_functions, name)
+
+    if name in globals().keys():
+        return globals()[name]
+    else:
+        raise AttributeError(f"module {__name__} has no attribute {name}")
+
+
 #-----------------------------------------------------------------------------
 # utility functions
 #-----------------------------------------------------------------------------

IPython/core/displaypub.py

@@ -22,7 +22,7 b' from traitlets.config.configurable import Configurable'
 from traitlets import List
 
 # This used to be defined here - it is imported for backwards compatibility
-from .display import publish_display_data
+from .display_functions import publish_display_data
 
 #-----------------------------------------------------------------------------
 # Main payload class

IPython/core/magics/display.py

@@ -12,7 +12,7 b''
 #-----------------------------------------------------------------------------
 
 # Our own packages
-from IPython.core.display import display, Javascript, Latex, SVG, HTML, Markdown
+from IPython.display import display, Javascript, Latex, SVG, HTML, Markdown
 from IPython.core.magic import  (
     Magics, magics_class, cell_magic
 )

IPython/core/page.py

@@ -24,7 +24,7 b' import subprocess'
 from io import UnsupportedOperation
 
 from IPython import get_ipython
-from IPython.core.display import display
+from IPython.display import display
 from IPython.core.error import TryNext
 from IPython.utils.data import chop
 from IPython.utils.process import system

IPython/core/pylabtools.py

@@ -354,7 +354,7 b' def import_pylab(user_ns, import_all=True):'
     
     # IPython symbols to add
     user_ns['figsize'] = figsize
-    from IPython.core.display import display
+    from IPython.display import display
     # Add display and getfigs to the user's namespace
     user_ns['display'] = display
     user_ns['getfigs'] = getfigs

IPython/core/tests/test_display.py

@@ -9,7 +9,7 b' from unittest import mock'
 
 import nose.tools as nt
 
-from IPython.core import display
+from IPython import display
 from IPython.core.getipython import get_ipython
 from IPython.utils.io import capture_output
 from IPython.utils.tempdir import NamedFileInTemporaryDirectory

IPython/display.py

@@ -12,5 +12,33 b''
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.core.display import *
+from IPython.core.display_functions import *
+from IPython.core.display import (
+    display_pretty,
+    display_html,
+    display_markdown,
+    display_svg,
+    display_png,
+    display_jpeg,
+    display_latex,
+    display_json,
+    display_javascript,
+    display_pdf,
+    DisplayObject,
+    TextDisplayObject,
+    Pretty,
+    HTML,
+    Markdown,
+    Math,
+    Latex,
+    SVG,
+    ProgressBar,
+    JSON,
+    GeoJSON,
+    Javascript,
+    Image,
+    set_matplotlib_formats,
+    set_matplotlib_close,
+    Video,
+)
 from IPython.lib.display import *

IPython/testing/iptest.py

@@ -57,6 +57,7 b" warnings.filterwarnings('error', message='.*onlyif_any_cmd_exists.*', category=D"
 warnings.filterwarnings('error', message='.*disable_gui.*', category=DeprecationWarning, module='.*')
 
 warnings.filterwarnings('error', message='.*ExceptionColors global is deprecated.*', category=DeprecationWarning, module='.*')
+warnings.filterwarnings('error', message='.*IPython.core.display.*', category=DeprecationWarning, module='.*')
 
 # Jedi older versions
 warnings.filterwarnings(