class_docstr: Magic allowing easy definition of compositor operations.
  Consult %compositor? for more information.
code: def __init__(self, *args, **kwargs):
      super().__init__(*args, **kwargs)
      lines = [
          "The %compositor line magic is used to define compositors."
      ]
      self.compositor.__func__.__doc__ = "\n".join(
          lines + [CompositorSpec.__doc__]
      )
  
imports: import sys
  import time
  from IPython.core.magic import Magics, line_cell_magic, line_magic, magics_class
  from IPython.display import HTML, display
  from ..core.options import Options, Store, StoreOptions, options_policy
  from ..core.pprint import InfoPrinter
  from ..operation import Compositor
  from IPython.core import page
label_desc: Use image node_id 1 to create a new CompositorMagic object from inherited base classes: Magics with example: obj = CompositorMagic()