code: def _set_wildcards(self, inputs=None, outputs=None):
          
  
          w = self._wildcards = set()  # Clean wildcards.
  
          if outputs and inputs:
              node, wi = self.nodes, self._wait_in.get  # Namespace shortcut.
  
              # Input data nodes that are in output_targets.
              w_crd = {u: node[u] for u in inputs if u in outputs or wi(u, False)}
  
              # Data nodes without the wildcard.
              w.update([k for k, v in w_crd.items() if v.get('wildcard', True)])
docs: Update wildcards set with the input data nodes that are also outputs.
  
          :param inputs:
              Input data nodes.
          :type inputs: list[str], iterable, optional
  
          :param outputs:
              Ending data nodes.
          :type outputs: list[str], iterable, optional