removing redundant allow_none=False

IPython/html/services/contents/manager.py

@@ -109,7 +109,7 b' class ContentsManager(LoggingConfigurable):'
 
     checkpoints_class = Type(Checkpoints, config=True)
     checkpoints = Instance(Checkpoints, config=True)
-    checkpoints_kwargs = Dict(allow_none=False, config=True)
+    checkpoints_kwargs = Dict(config=True)
 
     def _checkpoints_default(self):
         return self.checkpoints_class(**self.checkpoints_kwargs)

IPython/html/widgets/widget.py

@@ -140,7 +140,7 b' class Widget(LoggingConfigurable):'
     
     _property_lock = Tuple((None, None))
     _send_state_lock = Int(0)
-    _states_to_send = Set(allow_none=False)
+    _states_to_send = Set()
     _display_callbacks = Instance(CallbackDispatcher, ())
     _msg_callbacks = Instance(CallbackDispatcher, ())
     

IPython/html/widgets/widget_box.py

@@ -18,16 +18,16 b' class Box(DOMWidget):'
     # Child widgets in the container.
     # Using a tuple here to force reassignment to update the list.
     # When a proper notifying-list trait exists, that is what should be used here.
-    children = Tuple(sync=True, allow_none=False)
+    children = Tuple(sync=True)
     
     _overflow_values = ['visible', 'hidden', 'scroll', 'auto', 'initial', 'inherit', '']
     overflow_x = CaselessStrEnum(
         values=_overflow_values, 
-        default_value='', allow_none=False, sync=True, help="""Specifies what
+        default_value='', sync=True, help="""Specifies what
         happens to content that is too large for the rendered region.""")
     overflow_y = CaselessStrEnum(
         values=_overflow_values, 
-        default_value='', allow_none=False, sync=True, help="""Specifies what
+        default_value='', sync=True, help="""Specifies what
         happens to content that is too large for the rendered region.""")
 
     box_style = CaselessStrEnum(
@@ -59,10 +59,10 b' class FlexBox(Box):'
     _locations = ['start', 'center', 'end', 'baseline', 'stretch']
     pack = CaselessStrEnum(
         values=_locations, 
-        default_value='start', allow_none=False, sync=True)
+        default_value='start', sync=True)
     align = CaselessStrEnum(
         values=_locations, 
-        default_value='start', allow_none=False, sync=True)
+        default_value='start', sync=True)
 
 
 def VBox(*pargs, **kwargs):

IPython/html/widgets/widget_float.py

@@ -130,8 +130,7 b' class FloatSlider(_BoundedFloat):'
     """
     _view_name = Unicode('FloatSliderView', sync=True)
     orientation = CaselessStrEnum(values=['horizontal', 'vertical'], 
-        default_value='horizontal', 
-        help="Vertical or horizontal.", allow_none=False, sync=True)
+        default_value='horizontal', help="Vertical or horizontal.", sync=True)
     _range = Bool(False, help="Display a range selector", sync=True)
     readout = Bool(True, help="Display the current value of the slider next to it.", sync=True)
     slider_color = Unicode(sync=True)
@@ -285,8 +284,7 b' class FloatRangeSlider(_BoundedFloatRange):'
     """
     _view_name = Unicode('FloatSliderView', sync=True)
     orientation = CaselessStrEnum(values=['horizontal', 'vertical'], 
-        default_value='horizontal', allow_none=False, 
-        help="Vertical or horizontal.", sync=True)
+        default_value='horizontal', help="Vertical or horizontal.", sync=True)
     _range = Bool(True, help="Display a range selector", sync=True)
     readout = Bool(True, help="Display the current value of the slider next to it.", sync=True)
     slider_color = Unicode(sync=True)

IPython/html/widgets/widget_int.py

@@ -84,8 +84,7 b' class IntSlider(_BoundedInt):'
     """Slider widget that represents a int bounded by a minimum and maximum value."""
     _view_name = Unicode('IntSliderView', sync=True)
     orientation = CaselessStrEnum(values=['horizontal', 'vertical'], 
-        default_value='horizontal', allow_none=False, 
-        help="Vertical or horizontal.", sync=True)
+        default_value='horizontal', help="Vertical or horizontal.", sync=True)
     _range = Bool(False, help="Display a range selector", sync=True)
     readout = Bool(True, help="Display the current value of the slider next to it.", sync=True)
     slider_color = Unicode(sync=True)
@@ -196,8 +195,7 b' class IntRangeSlider(_BoundedIntRange):'
     """Slider widget that represents a pair of ints between a minimum and maximum value."""
     _view_name = Unicode('IntSliderView', sync=True)
     orientation = CaselessStrEnum(values=['horizontal', 'vertical'], 
-        default_value='horizontal', allow_none=False, 
-        help="Vertical or horizontal.", sync=True)
+        default_value='horizontal', help="Vertical or horizontal.", sync=True)
     _range = Bool(True, help="Display a range selector", sync=True)
     readout = Bool(True, help="Display the current value of the slider next to it.", sync=True)
     slider_color = Unicode(sync=True)

IPython/parallel/controller/scheduler.py

@@ -171,8 +171,8 b' class TaskScheduler(SessionFactory):'
         """
     )
     scheme_name = Enum(('leastload', 'pure', 'lru', 'plainrandom', 'weighted', 'twobin'),
-        'leastload', config=True, allow_none=False,
-        help="""select the task scheduler scheme  [default: Python LRU]
+        'leastload', config=True,
+help="""select the task scheduler scheme  [default: Python LRU]
         Options are: 'pure', 'lru', 'plainrandom', 'weighted', 'twobin','leastload'"""
     )
     def _scheme_name_changed(self, old, new):

IPython/terminal/console/interactiveshell.py

@@ -99,7 +99,7 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
 
     mime_preference = List(
         default_value=['image/png', 'image/jpeg', 'image/svg+xml'],
-        config=True, allow_none=False, help=
+        config=True, help=
         """
         Preferred object representation MIME type in order.  First
         matched MIME type will be used.