python opencv 'cv2.cv2 has no attribute' error solution

For examples, 

  AttributeError: module 'cv2.cv2' has no attribute 'TrackerCSRT_create'

  AttributeError: module ‘cv2.cv2’ has no attribute ‘saliency’

  ...

Because the 'contrib' module is not installed.

1. run cmd or PowerShell as 'administrator'

2. activate <env>

3. pip install opencv-contrib-python

Try your code again