code: def visit_Slice(self, node: ast.Slice) -> slice:
          
          lower = None  # type: Optional[int]
          if node.lower is not None:
              lower = self.visit(node=node.lower)
  
          upper = None  # type: Optional[int]
          if node.upper is not None:
              upper = self.visit(node=node.upper)
  
          step = None  # type: Optional[int]
          if node.step is not None:
              step = self.visit(node=node.step)
  
          result = slice(lower, upper, step)
  
          self.recomputed_values[node] = result
          return result
docs: Visit ``lower``, ``upper`` and ``step`` and recompute the node as a ``slice``.