[Python] IPython installation on Mac

I have uninstalled Anaconda on Mac and am now trying to install IPython using pip3.

When I try to install IPython, I get a prompt, "User for us-central1-python.pkg.dev: ". This asks for username and password. What should I enter here? I use GCP, and I have installed gsutil. I'm not sure if this is due to any GCP artifact. As root:

cd ~
python --version


Output:

zsh: command not found: python


And:

python3 --version


Output:

Python 3.9.6


And:

pip3 install ipython


Output:

Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.org/simple, https://us-central1-python.pkg.dev/workspace_code/analyticsv2-pypi/simple/
User for us-central1-python.pkg.dev:


I verified file ~/.pip/pip.conf. It has an entry as below

File ~/.pip/pip.conf


[global]
extra-index-url = https://us-central1-python.pkg.dev/workspace_code/analyticsv2-pypi/simple/

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