Python Gtk+ development in Linux using Eclipse + PyDev, Unresolved import: Gtk

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http://stackoverflow.com – I just tried to write my first Gtk+ program using python in linux mint with Eclipse + PyDev, but I met this error in PyDev, Unresolved import: Gtk program source code: http://python-gtk-3-tutorial.readthedocs.org/en/latest/introduction.html from gi.repository import Gtk win = Gtk.Window() win.connect("delete-event", Gtk.main_quit) win.show_all() Gtk.main() error shown as below: Program can run. I checked PYTHONPATH in PyDev, I think it's right. How can I fix this problem? By the way, could you give some advice about nice free IDE for Python & Gtk+ development in Linux? (HowTos)