starting Django shell but python interpreter kicks off

I started the Django's shell using:

python3 manage.py shell

but weirdly the python interpreter is kicking off instead (I see >>> instead of [n]:, and the initializing text contains no Django information, besides the main imports for the shell aren't executed)

considering that: I'm in ubuntu 20.04, It was running with no problem with python instead of python3, now python isn't recognized but it's linked to python3 so no difference "isn't it??!".

Such problems can appear if you're using global python installation instead of virtual enviroments. It's better to create a virtual enviroment.

sudo apt install -y python3-venv

Then cd to your project directory and execute:

python3 -m venv env
source venv/bin/activate

Then install your requirements and start django shell as usual, by executing

python manage.py shell