numpy having no "isin" attribute

Question

I tried using the np.isin() function but everytime I do, it returns me the error:

AttributeError: 'module' object has no attribute 'isin'

here is exactly what I do

import numpy as np
a = np.arange(9).reshape((3,3))
test = np.arange(5)
print np.isin(a, test)

I havent found any information about this problem, I use the latest version of numpy and havent had any problem with other numpy module, why does it returns me this error?

Answer 1

The isin function was added in NumPy 1.13:

New np.isin function, improves on in1d.

You're probably using an older version.

Answer 2

Reading through the Notes section of the docs shows

New in version 1.13.0.

I suspect that if you do

print(np.__version__)

you will see something less than 1.13.0.