def load(self, _=None):
        """
        Add formulas to layer.
        """
        for k, v in self.layer.iteritems():
            self.add(k, v['module'], v.get('package'))
def load ( self , _ = None ) : for k , v in self . layer . iteritems ( ) : self . add ( k , v [ 'module' ] , v . get ( 'package' ) )
Add formulas to layer.