remove type annotation comments not supported by latest black

pin black version in pre-commit-config.yaml

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/ambv/black
-    rev: stable
+    rev: 19.10b0
     hooks:
     - id: black
-      language_version: python
+      language_version: python

packages/python/plotly/plotly/basedatatypes.py

@@ -252,14 +252,11 @@ class is a subclass of both BaseFigure and widgets.DOMWidget.
         # Dict from trace indexes to trace edit dicts. These trace edit dicts
         # are suitable as `data` elements of Plotly.animate, but not
         # the Plotly.update (See `_build_update_params_from_batch`)
-        #
-        # type: OrderedDict[int, OrderedDict[str, typ.Any]]
         self._batch_trace_edits = OrderedDict()
 
         # ### Batch layout edits ###
         # Dict from layout properties to new layout values. This dict is
         # directly suitable for use in Plotly.animate and Plotly.update
-        # type: collections.OrderedDict[str, typ.Any]
         self._batch_layout_edits = OrderedDict()
 
         # Animation property validators
@@ -2984,38 +2981,32 @@ def __init__(self, plotly_name, **kwargs):
         # ---------------------
         # ### _validators ###
         # A dict from property names to property validators
-        # type: Dict[str, BaseValidator]
         self._validators = {}
 
         # ### _compound_props ###
         # A dict from compound property names to compound objects
-        # type: Dict[str, BasePlotlyType]
         self._compound_props = {}
 
         # ### _compound_array_props ###
         # A dict from compound array property names to tuples of compound
         # objects
-        # type: Dict[str, Tuple[BasePlotlyType]]
         self._compound_array_props = {}
 
         # ### _orphan_props ###
         # A dict of properties for use while object has no parent. When
         # object has a parent, it requests its properties dict from its
         # parent and doesn't use this.
-        # type: Dict
         self._orphan_props = {}
 
         # ### _parent ###
         # The parent of the object. May be another BasePlotlyType or it may
         # be a BaseFigure (as is the case for the Layout and Trace objects)
-        # type: Union[BasePlotlyType, BaseFigure]
         self._parent = None
 
         # ### _change_callbacks ###
         # A dict from tuples of child property path tuples to lists
         # of callbacks that should be executed whenever any of these
         # properties is modified
-        # type: Dict[Tuple[Tuple[Union[str, int]]], List[Callable]]
         self._change_callbacks = {}
 
     def _process_kwargs(self, **kwargs):
@@ -3831,7 +3822,6 @@ def _set_compound_prop(self, prop, val):
         # Import value
         # ------------
         validator = self._validators.get(prop)
-        # type: BasePlotlyType
         val = validator.validate_coerce(val, skip_invalid=self._skip_invalid)
 
         # Save deep copies of current and new states
@@ -3906,7 +3896,6 @@ def _set_array_prop(self, prop, val):
         # Import value
         # ------------
         validator = self._validators.get(prop)
-        # type: Tuple[BasePlotlyType]
         val = validator.validate_coerce(val, skip_invalid=self._skip_invalid)
 
         # Save deep copies of current and new states