always meet ModuleNotFoundError: No module named 'numpy'

I have installed numpy and my python has been 3.6 .but it still told me ModuleNotFoundError: No module named 'numpy'
,is there some question on my python path?

[houyaowei]

me too

[houyaowei]

os: ubuntu 7.3.0
python:3.6.7

[faridg18]

I had to manually install all libraries to get it to run. Also, I had to change 'python' to 'python3', I hope this helps. God speed.