class_docstr: Base class for vertices.
  
  **Attributes**
      e (list[Edge]): list of edges associated with this vertex.
docstr: degree() : degree of the vertex (number of edges).
code: def degree(self):
      """
      degree() : degree of the vertex (number of edges).
      """
      return len(self.e)
  
file_path: pygraphistry/graphistry/layout/graph/vertexBase.py
label_desc: Use image node_id 2 for calling the VertexBase obj's underlying member method code with example usage: obj.degree() and returns: len