python2 python3 messed up : How to fix ?

[Gribouillis]

It is not a nightmare any more. The only thing to remember is to not use Python 2.7 or to have an operating system where Python 2.7 is not installed.

If I understand well, you followed the instructions here https://github.com/armageddon421/electrodacus-esp32 to install platformio and in these instructions there was the following command

Output:
pip install -U platformio

Unfortunately, my guess is that the 'pip' command that you used was that of python 2.7.

Here is my suggestion

1. Run the command pip uninstall platformio
   
2. Then run the command python3.8 -m pip install -U platformio
   
3. Then run the command platformio update
   

Then see if it works better. It should as platformio's page on pypi is compatible with python 3 https://pypi.org/project/platformio/