comefrom: <doocs>0715.Range Module_1.py
code: def pushup( node):
      node.v = bool(node.left and node.left.v and node.right and node.right.v)
masked: def sample_funcname ( var_0 ) :
      var_0.v = bool ( var_0.left and var_0.left.v and var_0.right and var_0.right.v )
  