code: def read_moc(self, filename):
          
  
          if self.moc is None:
              self.moc = MOC(filename=filename)
  
          else:
              self.moc.read(filename)
docs: Read a file into the current running MOC object.
  
          If the running MOC object has not yet been created, then
          it is created by reading the file, which will import the
          MOC metadata.  Otherwise the metadata are not imported.