Graph in Python

class Graph:

   def __init__(self, vertices):
       self.adj = {}
       self.V = vertices
   
   def addEdge(self, fromVert, toVert):
       self.adj[fromVert].append(toVert)
       # self.adj[toVert].append(fromVert)

   def size(self):
       return self.V

   def getEdges(self, vertex):
       if vertex > self.V:
           return None
       return self.adj[vertex]