Creating Graphical User Interfaces (GUIs)
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Command-line tools are handy when you need small tools that don’t require visual interaction or batch processing. But a command-line program’s user interface is usually limited to text input/output and files. This is sometimes not sufficient when 2D (or even 3D) visual interaction is required. So this chapter breaks out of the constraint of the command-line interface and talks about graphical user interfaces (GUIs).