"python3 manage.py shell" using IPython instead of Python.

[J Arun Mani]

Hello, I was learning Django from the official docs.
To run the command python3 manage.py shell, I thought of using IPython, so I ran this command ipython3 manage.py shell. First the command gave me a list of available commands (for manage.py), then it gave me the IPython prompt. Me, confused, ran the same command with python3, but I still got IPython. I closed the shell and launched it again, I went back to home directory and checked if IPython and Python are working fine, yes they were, they were working with the right way.

So I cded the tutorial's directory and ran python3 manage.py shell but again got IPython shell.
The issue is why am I getting IPython when I run the command for normal Python interpreter?
I think Django has modified some environment flags or something else. I thought of posting this to mailing-list, as I'm a noob and this could be a "feature"; but I got an error that there is googlegroups cannot find "django-users" account. I have attached a link to the screenshot for sake of convenience.

My System:
Django installed using : pip (only for user, non-sudo)
OS : Debian 10
Python version : 3.7.3
Terminal : GNOME Terminal
Shell : fish

[Mariusz Felisiak]

I don't see any issue in the ticket description. Using ipython is a ​documented behavior.

[J Arun Mani]

Replying to felixxm:

I don't see any issue in the ticket description. Using ipython is a ​documented behavior.

But I'm not using django-admin shell -i ipython I ran the command like this python3 manage.py shell, previously (in previous tutorials of Django from other websites), this command invoked the default Python 3 interpreter, then why suddenly did it start using IPython?