class_docstr: Base class for vertices.
  
  **Attributes**
      e (list[Edge]): list of edges associated with this vertex.
docstr: either e_in, e_out or all edges depending on provided direction parameter (>0 means outward).
code: def e_dir(self, dir):
      """
      either e_in, e_out or all edges depending on provided direction parameter (>0 means outward).
      """
      if dir > 0:
          return self.e_out()
      if dir < 0:
          return self.e_in()
      return self.e
  
file_path: pygraphistry/graphistry/layout/graph/vertexBase.py
label_desc: Use image node_id 5 for calling the VertexBase obj's underlying member method code with example usage: obj.e_dir(dir) and returns: self, self, self