Error when using password parameter in Py2neo when creating a Graph object

Question

I'm trying to create a Graph object in python using the py2neo library using interactive python. See output below.

>>> from py2neo import Graph
>>> myGraph = Graph(password='xxxx')

Traceback (most recent call last): File "", line 1, in TypeError: new() got an unexpected keyword argument 'password'

I don't understand why I'm getting the unexpected keyword argument error.