How to open Python?

[bensan]

I can try to give some getting stated tips.

"Once in shell of your choice cd (change directory) ...." That is alien to me but I may understand it better after I investigate your links.

This is a little worrying as you done other stuff for a while and not learned command line better cmd tutorial .
Command line usage is very important in programming,i use cmder which is lot better,you can look at it later.

Start:
Python 3.9/3.8 and pip installation under Windows
Try follow this and eg install Python 3.9.5 and run command and code from cmd.
It's important that python and pip commands work from anywhere in cmd(Then OS Path is ok).

Editor:
Here would i suggest one that is very simple to use and also good editor.
PyScripter

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And why are the tutorials not describing how Python should be integrated with HTML & CSS?

There are many out there,get the basic to work first.
In Python is Flask and Django the biggest.
Flask is more similar to basic PHP programming as you close to HTML/CCS.
Have tutorial here basic setup Flask and Flask]Weather app
And very good Editor for Python(alone) or when programming with web-development
VS Code from start

Thanks @snippsat. Ive run some testing but nothing has worked. First I rebooted, then I changed all directory names to lower case, then installed Python v3.9.5 & everything is the same. Python text editor will not open or appear.

If I enter "python" only into the Windows command + hit enter the Python command window appears. If I enter some maths it works. If I enter print("Hello World") it works. So it appears as if Python is installed correctly.

But all of that I dont want coz it is no use to me. I want to start learning on how to create a simple text editor. All the example coding Ive used does not work.

This is the last one I tried -

 https://www.geeksforgeeks.org/build-a-basic-text-editor-using-tkinter-in-python/ 

This is what I entered into the Windows command line -

 python /C:/PythonProjects/TextEditor.py 

& I also tried it in lower case.

I am using my old favorite text editor UltraEdit because Im very familiar with everything. I will consider other editors if & when UltraEdit gives a problem or there is some kind of limitation. All I want at this stage is to get a program to appear.

I prefer a program appearing in a browser as it is web application that I am doing. I do not like using a command line as that is not web development. Why is the Common Gateway Interface (CGI) standard not being used? I mentioned that subject earlier but nobody commented.

You suggested Django but that is a framework. I am already using the CodeIgniter framework & I doubt if two frameworks will work together. CodeIgniter allows for in & out of PHP & HTML & will probably allow Python in & out & back into PHP. While PHP & HTML are going in & out my system is still in CodeIgniter. I doubt if Django will allow the entry of PHP.

Another doubt I have. Will a Python text editor with a macro "select copy & paste"? If it wont do that Im probably wasting my time with Python.

I have spent the last month trying to get Python to work but achieve absolutely nothing.