re-export link and dlink from traitlets for consistency with the java…

…script API

docs/source/examples/Widget Events.ipynb

@@ -316,7 +316,7 @@
     "caption = widgets.Label(value='The values of slider1 and slider2 are synchronized')\n",
     "sliders1, slider2 = widgets.IntSlider(description='Slider 1'),\\\n",
     "                    widgets.IntSlider(description='Slider 2')\n",
-    "l = traitlets.link((sliders1, 'value'), (slider2, 'value'))\n",
+    "l = widgets.link((sliders1, 'value'), (slider2, 'value'))\n",
     "display(caption, sliders1, slider2)"
    ]
   },
@@ -372,7 +372,7 @@
     "caption = widgets.Label(value='Changes in source values are reflected in target1')\n",
     "source, target1 = widgets.IntSlider(description='Source'),\\\n",
     "                  widgets.IntSlider(description='Target 1')\n",
-    "dl = traitlets.dlink((source, 'value'), (target1, 'value'))\n",
+    "dl = widgets.dlink((source, 'value'), (target1, 'value'))\n",
     "display(caption, source, target1)"
    ]
   },
@@ -657,9 +657,9 @@
     "c = widgets.IntSlider(description=\"Continuous\", continuous_update=True)\n",
     "d = widgets.IntText(description=\"Continuous\", continuous_update=True)\n",
     "\n",
-    "traitlets.link((a, 'value'), (b, 'value'))\n",
-    "traitlets.link((a, 'value'), (c, 'value'))\n",
-    "traitlets.link((a, 'value'), (d, 'value'))\n",
+    "widgets.link((a, 'value'), (b, 'value'))\n",
+    "widgets.link((a, 'value'), (c, 'value'))\n",
+    "widgets.link((a, 'value'), (d, 'value'))\n",
     "widgets.VBox([a,b,c,d])"
    ]
   },

ipywidgets/__init__.py

@@ -23,6 +23,7 @@
 from IPython import get_ipython
 from ._version import version_info, __version__, __protocol_version__, __jupyter_widgets_controls_version__, __jupyter_widgets_base_version__
 from .widgets import *
+from traitlets import link, dlink
 
 
 def load_ipython_extension(ip):