code: def set_start_method(self, method, force=False):
      raise ValueError("cannot set start method of concrete context")
  
imports: import os
  import sys
  import threading
  from .None import process
  from .None import reduction
label_desc: Use image node_id 27 for calling the BaseContext obj's underlying member method code with example usage: obj.set_start_method(method, force) without return types