​https://medium.com/swlh/create-a-simple-python-gui-with-these-open-source-projects-7957813a107a

Most common tools: PyGuBU, Page, Gooey and PySimpleGui. PySimpleGui is not a design tool but is rather understandable and comes with a lot of samples. The other tools where very hard to install and didn't work properly on my Mac system.

pip install PySimpleGui
https://pypi.org/project/PySimpleGUI/
​works fine
tutorial PySimpleGui
cookbook

Design the class, decide which attributes you need

Make a collection and fill the collection with instances of MyCustomer. Read the collection and print it.

Python is a functional programming language, positional bound.
It's syntax is easy to understand. The ":" sign plays a very significant role.
You see it in functions:
def open_directory(mydir, mytitle):
as well as in "if" statements:
if not dirpath: return
It is allowed to store all code in one file, you can mix classes with functions.
And it's even allowed to use functions within functions! Very helpful.

Of course you need an editor. I'm very happy with Jetbrains PyCharm, there is even a free public version

As a sample I've added some code here to start with a GUI: