[Python] How can I manage virtual environments with pyenv?

Scenario

I would like to start a new project in Python. I need a different version of Python than the one on my system (Ubuntu 23.10 (Mantic Minotaur)), so I followed the steps below:

• 
  I downloaded pyenv and installed the desired version of the Python interpreter;
  
  
• 
  I moved into the project folder
  
  
• 
  I created a virtual environment via pyenv
  
  
• 
  Now I have to install my dependencies into the venv
  

Before install any package, I checked the Python version to make sure I'm using the correct version of Python, but the output confused me:

Outside the project directory using python


cd ~/Outside_Project_Folder
python --version


Output:

pyenv: python: command not found

The `python` command exists in these Python versions:
3.12.3
3.12.3/envs/.venv
.venv

Note: See `pyenv help global` for tips on allowing both
python2 and python3 to be found.


And:

which python


Output:

/home/usr/.pyenv/shims/python

Outside the project directory using python3


cd ~/Outside_Project_Folder
python3 --version


Output:

Python 3.11.6


And:

which python


Output:

/home/usr/.pyenv/shims/python3

Inside the project directory using python or python3


cd ~/Project
python --version


Output:

Python 3.12.3


which python


Output:

/home/usr/.pyenv/shims/python


Question

I am confused about how to install dependencies within the virtual environment associated with the version of python installed with pyenv.

I thought about running pip install from within the project folder, but I'm afraid that doing so might pollute the version of Python installed via pyenv.

I would like to install the packages exclusively for my project, but how do I understand if I am inside the virtual environment?

Also how do I figure out what is the current active version of Python wherever I am in the file system?

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