How do I get the execution screen titled MyCentOS... or edit Python code?

I checked the video site.

"There is a video about building a development environment on the link page called ""Supplementary Information Required Knowledge"", so I think you can create the same environment as the video if you watch it first."

#01 Try Python| Python 3 Introduction - Dot Install for Programming

"Also, the ""myapp.py"" tab seems to be a text editor called Atom."
The video says, "Anything is fine, but this time it's Atom."

You seem to be using a virtual machine, editor, and terminal in the video.

When using IDLE

• The editor screen appears under the "File" menu in the IDLE menu, under the "New File" or "Open" items.
• Enter the code in the editor and save it to a file such as "File" - > "Save" on the menu.
• Run with "Run" - > "Run Module" in the editor menu.

This should reset the IDLE shell and display any output, such as print.

To match the video

Please refer to take88's response.
(I think IDLE is convenient and excellent to move first, but I will graduate eventually.Even if you don't fit the video perfectly, you should remember how to use the editor and terminal.)