PyGTK Drag and Drop error

I have currently started learning about Python and its GUI library GTK (PyGTK) However I have tried the example:

http://python.developpez.com/cours/pygtktutorial/php/pygtken/sec-DNDMethods.php#dragndropfig

Which is a simple drag and drop and I get the error

Traceback (most recent call last):
  File "test.py", line 10, in <module>
    import gtkxpm
ImportError: No module named gtkxpm

I tried googling the error but have had no luck.

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