What steps can I take to create a Python GUI that meets my desired specifications using custom Tkinter?

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Plan out the design and layout of your GUI. Decide on the elements you need, such as buttons, labels, and input fields, and create a rough sketch of how they will all fit together.

Create a new Python file to serve as the code for your GUI. Import the Tkinter module.

Design the layout of your GUI using the various Tkinter widgets. Create the window using the Tk class, and add widgets to it as needed.

Customize the appearance of your GUI using various Tkinter styling options. This may include changing the font, color, and size of various elements.

Add functionality to your GUI by creating event-driven functions that are triggered by user interactions with the various widgets.

Test your GUI to make sure it functions as intended, and tweak any aspects of the design or functionality as needed.

Add any final touches, such as incorporating images or advanced widgets, before releasing your GUI out into the world.