Allow PlotlyDict and PlotlyList to be used.

We can now instantiate them with a `_name` kwarg, which is how we’ll
get around needing special classes for each object.

Author: theengineear

plotly/graph_objs/graph_objs.py

@@ -121,15 +121,17 @@ class PlotlyList(list, PlotlyBase):
     _name = None
 
     def __init__(self, *args, **kwargs):
+        _raise = kwargs.get('_raise', True)
+        if self._name is None:
+            self.__dict__['_name'] = kwargs.pop('_name', None)
+        self.__dict__['_parent'] = kwargs.get('_parent')
+        self.__dict__['_parent_key'] = kwargs.get('_parent_key')
+
         if self._name is None:
             raise exceptions.PlotlyError(
                 "PlotlyList is a base class. It's shouldn't be instantiated."
             )
 
-        _raise = kwargs.get('_raise', True)
-        self.__dict__['_parent'] = kwargs.get('_parent')
-        self.__dict__['_parent_key'] = kwargs.get('_parent_key')
-
         if args and isinstance(args[0], dict):
             raise exceptions.PlotlyListEntryError(
                 obj=self,
@@ -347,15 +349,18 @@ class PlotlyDict(dict, PlotlyBase):
     _subplot_attributes = None
 
     def __init__(self, *args, **kwargs):
-        if self._name is None:
-            raise exceptions.PlotlyError(
-                "PlotlyDict is a base class. It's shouldn't be instantiated."
-            )
 
         _raise = kwargs.pop('_raise', True)
+        if self._name is None:
+            self.__dict__['_name'] = kwargs.pop('_name', None)
         self.__dict__['_parent'] = kwargs.pop('_parent', None)
         self.__dict__['_parent_key'] = kwargs.pop('_parent_key', None)
 
+        if self._name is None:
+            raise exceptions.PlotlyError(
+                "PlotlyDict is a base class. It's shouldn't be instantiated."
+            )
+
         super(PlotlyDict, self).__init__()
 
         if self._name in graph_reference.TRACE_NAMES: