[Python] Why can I use NumPy with Python 3.8 which was preinstalled but not with Python 3.9...

I installed Ubuntu 20.04, and python3 (3.8) is installed by default. To install python3.9, I executed:

sudo apt install python3.9


Thus, I have two versions of Python at my laptop: 3.8 and 3.9.

I'm trying to launch the simple script:

import numpy


With Python 3.8 it works correctly. But, when I interp my script by Python 3.9 the error occurs:



How to solve this problem?

I've already tried to update numpy using pip, nothing has happened.

pip3 install numpy --upgrade

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