How to open .TRE file?

Hi @Stephen_Aylward
When I use “pip install itk-tubetk” (version 0.9.0) to install TubeTK, I can’t import itk-tubetk:

No module named 'itk_tubetk'

Do you have any better suggestions? Also, when I use itk (version 5.2.1) to convert “.tre” files, I got following errors:

itkImageF4 not loaded from module TubeTK because of exception:
 module 'itk.TubeTKPython' has no attribute 'itkImageF4'
vectoritkImageF4 not loaded from module TubeTK because of exception:
 module 'itk.TubeTKPython' has no attribute 'vectoritkImageF4'

P.S. itk is installed with the pip install itk command.

Best,
Ray