doc strings to for node item position.

Author: jchanvfx

NodeGraphQt/qgraphics/node_abstract.py

@@ -154,10 +154,24 @@ def visible(self, visible=False):
 
     @property
     def xy_pos(self):
+        """
+        return the item scene postion.
+        ("node.pos" conflicted with "QGraphicsItem.pos()" so it was refactored to "xy_pos".)
+
+        Returns:
+            list[float]: x, y scene position.
+        """
         return [float(self.scenePos().x()), float(self.scenePos().y())]
 
     @xy_pos.setter
     def xy_pos(self, pos=None):
+        """
+        set the item scene postion.
+        ("node.pos" conflicted with "QGraphicsItem.pos()" so it was refactored to "xy_pos".)
+
+        Args:
+            pos (list[float]): x, y scene position.
+        """
         pos = pos or [0.0, 0.0]
         self.setPos(pos[0], pos[1])
 
@@ -211,6 +225,7 @@ def from_dict(self, node_dict):
         node_attrs = list(self._properties.keys()) + ['width', 'height', 'pos']
         for name, value in node_dict.items():
             if name in node_attrs:
+                # "node.pos" conflicted with "QGraphicsItem.pos()" so it's refactored to "xy_pos".
                 if name == 'pos':
                     name = 'xy_pos'
                 setattr(self, name, value)