old_contents: from pyffi.utils.withref import ref
  from pyffi.formats.nif import NifFormat
  
  class Material():
      '''Helper class for common building nifs with materials'''
  
      def n_create(self, n_data):
          """Attact a NiMaterial block to Trishape[0]"""
                  
          n_trishape = n_data.roots[0].children[0]
          n_data.roots[0].children[0] = self.n_attach_material_prop(n_trishape)
          return n_data
      
      def n_attach_material_prop(self, n_block):
          '''Attach a NiMaterialProperty to a blocks properties array at pos[0]'''
  
          n_nimaterialprop = NifFormat.NiMaterialProperty()
  
          # add property to top of list
          n_block.properties.reverse()
  
          n_block.num_properties += 1
          n_block.properties.update_size()
          n_block.properties[-1] = n_nimaterialprop
  
          n_block.properties.reverse()
  
          n_nimaterialprop.name = b'Material'
          with ref(n_nimaterialprop.ambient_color) as ambient_color:
              ambient_color.r = 1.0
              ambient_color.g = 1.0
              ambient_color.b = 1.0
          with ref(n_nimaterialprop.diffuse_color) as diffuse_color:
              diffuse_color.r = 1.0
              diffuse_color.g = 1.0
              diffuse_color.b = 1.0
          with ref(n_nimaterialprop.emissive_color) as emissive_color:
              emissive_color.r = 0.5
          n_nimaterialprop.glossiness = 25.0
          n_nimaterialprop.alpha = 1.0
  
          return n_block
new_contents: from pyffi.utils.withref import ref
  from pyffi.formats.nif import NifFormat
  
  class Material:
      '''Helper class for common building nifs with materials'''
  
      def n_create(self, n_data):
          """Attact a NiMaterial block to Trishape[0]"""
                  
          n_trishape = n_data.roots[0].children[0]
          n_data.roots[0].children[0] = self.n_attach_material_prop(n_trishape)
          return n_data
      
      def n_attach_material_prop(self, n_block):
          '''Attach a NiMaterialProperty to a blocks properties array at pos[0]'''
  
          n_nimaterialprop = NifFormat.NiMaterialProperty()
  
          # add property to top of list
          n_block.properties.reverse()
  
          n_block.num_properties += 1
          n_block.properties.update_size()
          n_block.properties[-1] = n_nimaterialprop
  
          n_block.properties.reverse()
  
          n_nimaterialprop.name = b'Material'
          with ref(n_nimaterialprop.ambient_color) as ambient_color:
              ambient_color.r = 1.0
              ambient_color.g = 1.0
              ambient_color.b = 1.0
          with ref(n_nimaterialprop.diffuse_color) as diffuse_color:
              diffuse_color.r = 1.0
              diffuse_color.g = 1.0
              diffuse_color.b = 1.0
          with ref(n_nimaterialprop.emissive_color) as emissive_color:
              emissive_color.r = 0.5
          n_nimaterialprop.glossiness = 25.0
          n_nimaterialprop.alpha = 1.0
  
          return n_block
  
subject: Remove unneeded brackets from Material class.