parameters: (self)
return_statement: return self._cached_host_pk_set
docstring: Returns cached set of existing / previous host primary key values
          this is the starting set, meaning that it is pre-modification
          by deletions and other things done in the course of this import
docstring_summary: Returns cached set of existing / previous host primary key values
          this is the starting set, meaning that it is pre-modification
          by deletions and other things done in the course of this import
docstring_tokens: Returns cached set of existing / previous host primary key values this is the starting set meaning that it is pre - modification by deletions and other things done in the course of this import
function: def _existing_host_pks(self):
          """Returns cached set of existing / previous host primary key values
          this is the starting set, meaning that it is pre-modification
          by deletions and other things done in the course of this import
          """
          if not hasattr(self, '_cached_host_pk_set'):
              self._cached_host_pk_set = frozenset(self.inventory_source.hosts.values_list('pk', flat=True))
          return self._cached_host_pk_set
function_tokens: def _existing_host_pks ( self ) : if not hasattr ( self , '_cached_host_pk_set' ) : self . _cached_host_pk_set = frozenset ( self . inventory_source . hosts . values_list ( 'pk' , flat = True ) ) return self . _cached_host_pk_set