AttributeError: module 'numpy' has no attribute 'matlib' [duplicate]

Question

I recently started coding in Python. In the beginning of my scripts I always have the following import: import numpy as np.

In one of my scripts, I use np.matlib.repmat function. It used to work ok, however recently it fails to run showing the following error:

 AttributeError: module 'numpy' has no attribute 'matlib'

I searched SO for this problem, and it looks like the error like this arises if one has a script called numpy.py in his working directory or if the installed version is different and does not contain the called module.

I didn't name any file numpy.py. I also found out that after I call:

 from numpy import matlib as mb

I can use mb.repmat. Therefore, my numpy module does contain matlib module. Can someone hint me, why I cannot call np.matlib?

Answer 1

This was already answer here.

This is because numpy.matlib is an optional sub-package of numpy that must be imported separately. When you import just numpy without the sub-package matlib, then Python will be looking for .matlib as an attribute of the numpy package. This attribute has not been assigned to numpy without importing numpy.matlib