Why doesn't pyenv activate the environment with the new python interpreter (Ubuntu 20.04.3 LTS)?

Question

Python

Before installing docker and docker-compose on the machine, the command to check the python 3 version seems to work through an alias:
python -V -> Python 3.8.10

After installing the alias, it stopped working, now the command looks like this:

python -V -> Команда «python» не найдена...
python3 -V -> Python 3.8.10

Now installed pyenv , installed Python==3.7.7 .
Registered settings for .bashrc :

# ---PYENV---
export PYENV_ROOT="$HOME/.pyenv"
export PATH="$HOME/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

Created a virtual environment with the required version of Python==3.7.7 :
pyenv virtualenv 3.7.7 env_project

Thanks to the .bashrc config , when you enter the directory from which the pyenv environment was created , it is automatically pulled up:

(env_project) [email protected]:~/path1/path2/path3/3_7_7$

But still, python activation doesn't happen:

(env_project) [email protected]:~/path1/path2/path3/3_7_7$ python -V -> Команда «python» не найдена...
(env_project) [email protected]:~/path1/path2/path3/3_7_7$ python3 -V -> Python 3.8.10
(env_project) [email protected]:~/path1/path2/path3/3_7_7$ pyenv which python -> /home/user-name/.pyenv/versions/env_project/bin/python
(env_project) [email protected]:~/path1/path2/path3/3_7_7$ pyenv which python3 -> /home/user-name/.pyenv/versions/env_project/bin/python3

In order to normally activate the environment and it really worked, you have to activate it like on windows:

source "/home/user-name/.pyenv/versions/env_project/bin/activate"

And then the commands are executed correctly:
python -V -> Python 3.7.7

A crutch, and an unpleasant one at that...

But most of all I'm interested in how to make pyenv friends with VS CODE it will pseudo-run as always:

pyenv shell env_project
(env_project) [email protected]:~/path1/path2/path3/3_7_7$

And again, an attempt to run Python of the desired version will fail (already from the VS CODE console ):

pyenv shell env_project
(env_project) [email protected]:~/path1/path2/path3/3_7_7$ python -V -> Команда «python» не найдена...
(env_project) [email protected]:~/path1/path2/path3/3_7_7$ python3 -V -> Python 3.8.10

I have to go back to the crutch above ...

Tell me, what am I doing wrong?

Answer 1

Found a solution.
As it turned out, you need to add an additional line to the .bashrc configuration file , which is not in the installation documentation:

# ---PYENV---
export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init --path)" # <- Без нее почему-то не работало
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

Before line:
After: