docstr: get list of lower bounds
docstr_tok: ["get","list","of","lower","bounds"]
code: def __lower(self):
      "get list of lower bounds"
      n = (self.n,) if not hasattr(self.n, "__len__") else self.n
      xlb = (
          (self.xlb,) if not hasattr(self.xlb, "__len__") else self.xlb
      )
      return list(flatten(i * [j] for i, j in zip(n, xlb)))
  
imports: from mystic.tools import flatten
label_desc: Use image node_id 3 for calling the Bounds obj's underlying member method code with example usage: obj.__lower() and returns: list