class_docstr: Execution style representing an order to be executed at a price equal to or
  better than a specified limit price.
code: def get_stop_price(self, _is_buy):
      return None
  
imports: import abc
  from numpy import isfinite
  from six import with_metaclass
  from catalyst.errors import BadOrderParameters
label_desc: Use image node_id 3 for calling the LimitOrder obj's underlying member method code with example usage: obj.get_stop_price(_is_buy) and returns: None