Make Class Convertable To Ndarray

Other than by subclassing (from list for example) how do I make a python object implicitly convertable to ndarray? Example: import numpy arg=[0,1,2] numpy.dot(arg,arg) # OK, arg is

Solution 1:

__len__ seems to be the key feature: just adding a

def__len__(self):
    return3

made the class work in numpy.dot.