code: def _prepare_resources(self, variables, overrides=None):
          
  
          if overrides is None:
              overrides = {}
  
          res_map = {}
          own_map = {}
  
          for decl in self.resources.values():
              resource = overrides.get(decl.name)
  
              if resource is None:
                  args = _complete_parameters(decl.args, variables)
                  resource = decl.type(args)
                  own_map[decl.name] = resource
  
              if decl.autocreate:
                  resource.open()
  
              res_map[decl.name] = resource
  
          return res_map, own_map
docs: Create and optionally open all shared resources.