For clarity, move creation of child object lists explicitly into constructors of Block, Segment, Group, instead of doing it in the parent class Container.

Author: apdavison

neo/core/block.py

@@ -86,6 +86,8 @@ def __init__(self, name=None, description=None, file_origin=None,
         self.file_datetime = file_datetime
         self.rec_datetime = rec_datetime
         self.index = index
+        self.segments = []
+        self.groups = []
         self.regionsofinterest = []   # temporary workaround.
         # the goal is to store all sub-classes of RegionOfInterest in a single list
         # but this will need substantial changes to container handling

neo/core/container.py

@@ -233,10 +233,6 @@ def __init__(self, name=None, description=None, file_origin=None,
         super().__init__(name=name, description=description,
                          file_origin=file_origin, **annotations)
 
-        # initialize containers
-        for container in self._child_containers:
-            setattr(self, container, [])
-
     @property
     def _single_child_objects(self):
         """

neo/core/group.py

@@ -48,10 +48,23 @@ def __init__(self, objects=None, name=None, description=None, file_origin=None,
                  allowed_types=None, **annotations):
         super().__init__(name=name, description=description,
                          file_origin=file_origin, **annotations)
+
+        self.analogsignals = []
+        self.irregularlysampledsignals = []
+        self.spiketrains = []
+        self.events = []
+        self.epochs = []
+        self.channelviews = []
+        self.imagesequences = []
+        self.segments = []  # to remove?
+        self.groups = []
+        self.block = None
+
         if allowed_types is None:
             self.allowed_types = None
         else:
             self.allowed_types = tuple(allowed_types)
+
         if objects:
             self.add(*objects)
 

neo/core/segment.py

@@ -91,7 +91,16 @@ def __init__(self, name=None, description=None, file_origin=None,
         '''
         super().__init__(name=name, description=description,
                          file_origin=file_origin, **annotations)
+
+        self.analogsignals = []
+        self.irregularlysampledsignals = []
         self.spiketrains = SpikeTrainList(segment=self)
+        self.events = []
+        self.epochs = []
+        self.channelviews = []
+        self.imagesequences = []
+        self.block = None
+
         self.file_datetime = file_datetime
         self.rec_datetime = rec_datetime
         self.index = index