How to open Python?

[snippsat]

I have read your part of the command line but quite frankly Im not very interested in that. I see that is the job of the Python developers to understand & formulate some kind of window application for web developers to follow & clearly understand

You have to lean basic command line stuff,or just silly for me to spend more time on this than i already have done.
If a Python developers do not how to use command line he will never ever get any job.

And do I need to download & install Flask?

All is done from command line with pip,that's why you should do pip -V to see that pip work.

# Test pip
C:\Users\Tom>pip -V
pip 21.1.1 from c:\python39\lib\site-packages\pip (python 3.9)

# Install flask
C:\Users\Tom>pip install flask
Collecting flask
  Using cached Flask-2.0.1-py3-none-any.whl (94 kB)
Requirement already satisfied: Werkzeug>=2.0 in c:\python39\lib\site-packages (f
rom flask) (2.0.1)
Requirement already satisfied: itsdangerous>=2.0 in c:\python39\lib\site-package
s (from flask) (2.0.1)
Requirement already satisfied: Jinja2>=3.0 in c:\python39\lib\site-packages (fro
m flask) (3.0.1)
Requirement already satisfied: click>=7.1.2 in c:\python39\lib\site-packages (fr
om flask) (7.1.2)
Requirement already satisfied: MarkupSafe>=2.0 in c:\python39\lib\site-packages
(from Jinja2>=3.0->flask) (2.0.1)
Installing collected packages: flask
Successfully installed flask-2.0.1

C:\Users\Tom>