Can't import pystan and pymc3

import os
print(os)
<module ‘os’ from ‘C:\Users\LuisEmerson\anaconda3\lib\os.py’>

I have installed pystan and pymc3, I installed and reinstalled by pip and conda.
I installed:
pip install pymc3
python -m pip install pymc3
conda install pymc3 -c conda-forge

I created new environment
conda activate stan_env

then, I when try import:
import pystan
ImportError: No module named pymc3