code: def newLayer(self, effect=''):
  		
  		self.layers.append(Layer(effect = effect))
  		self.activeLayer = len(self.layers)-1
docs: Creates a new :py:class:`Layer` and set that as the active.
  		
  		:param effect: A string with the blend mode for that layer that will be used when during the rendering process. The accepted values are: :code:`'soft_light','lighten','screen','dodge','addition','darken','multiply','hard_light','difference','subtract','grain_extract','grain_merge','divide','overlay'`.
  		:rtype: Nothing.