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   Append a new datablock from a library. The new copy is added to the 
  current .blend file. 
  Note: Blender Objects cannot be appended or linked without 
  linking them to a scene.  For this reason, lib.objects.append() returns a
  special "wrapper object" which must be passed to 
  Scene.objects.link() or bpy.data.scenes.active.link() in order to 
  actually create the object. So the following code will not create a new 
  object:
       import bpy
       scn= bpy.data.scenes.active                       # get current scene
       lib = bpy.libraries.load('//file.blend')          # open file.blend
       pseudoOb = lib.objects.append('Cube'))            # get an object wrapper
  But this code will:
       import bpy
       scn= bpy.data.scenes.active                       # get current scene
       lib = bpy.libraries.load('//file.blend')          # open file.blend
       pseudoOb = lib.objects.append('Cube'))            # get an object wrapper
       ob = scn.objects.link(pseudoOb)                                   # link to scene
  
    - Returns: Blender data
 
        - return a Blender datablock or object
 
    - Raises:
 
    
        IOError - library cannot be read 
        ValueError - library does not contain name 
      
   
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