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I am new to GUI programming, and I haven't found yet what library is best for my purpose (i want to make desktop environment applications, eg. docks, panels, desklets etc.) I have started learning basics of GTK, mainly using PyGtk. Most tutorials i found on line are for GTK+2.0. Recently however, GTK+3 has been released. So i am a bit unsure as to what that means for my learning curve:
Since i'm new to this, i'm throwing myself into it blindly, but a bit of guidance may be wiser. So if you have any, you're welcome :)
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GTK (formerly GIMP ToolKit and GTK+) is a free and open-source cross-platform widget toolkit for creating graphical user interfaces (GUIs). It is licensed under the terms of the GNU Lesser General Public License, allowing both free and proprietary software to use it.
GTK is written using the C programming language, but its also available to various programming languages through language bindings, which allow writing GTK applications in the style of those languages. Language bindings are relatively easy to create because GTK is designed with them in mind.
GTK (GIMP Toolkit) is a library for creating graphical user interfaces. It is licensed using the LGPL license, so you can develop open software, free software, or even commercial non-free software using GTK without having to spend anything for licenses or royalties.
GTK/GTK+ and GTK2 are different versions of the same API. GTK is an old, deprecated version, GTK2 is the previous one, GTK+ 3/GTK3 is the current version. GTK+ is the correct name of the old API, but most people just call it GTK.
Definitely go with GTK 3. The 10-minute tutorials on http://developer.gnome.org/ use GTK 3 and are an excellent introduction to programming with GTK in several languages, including Python. In the coming months you will probably see more tutorials appear for GTK 3, and in the meantime, you will still be able to get most tutorials for GTK 2 to work with a minimum of fuss. The basics aren't all that different.
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Although late, I would like to share this information in the hope that it will be useful for anyone who have this doubt in future.
As ptomato said, GTK+ 3 is the way to go and much of the GTK+2 knowledge is applicable to GTK+3 also. PyGObject is the way to go with GTK+3, not PyGTK. See: PyGTK, GObject, and GNOME 3 to get an overall idea about this new change.
To know what differs and how to cope up with these changes, see:
About the tutorials, following ones will be of helpful:
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