[Solved] What is my mistake?

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from bulbs.config import Config, DEBUG
from bulbs.rexster import Graph
from bulbs.titan import Graph

config = Config('http://localhost:8182/graphs/ramgraph')
g = Graph(config)


class inser_class():
    ponnapu = g.vertices.create(name="reddy", age="26", state="TELNGANA", mobn="111111111")
    pr = g.vertices.create(name="ramnath" ,age="25" , state="TELNGANA", mobn="1111111")
    tanu = g.vertices.create (name="ponnapu",age="27",state="AP",mobn="11111111111111")
    g.edges.create(pr, "knows", tanu)
    g.edges.create(pr, "friends", ponnapu)
    g.edges.create(ponnapu, "dontknow",tanu)

solved What is my mistake?