My first python plugin review

[origamifreak2]

I have a question. The gimp_drawable_type() function on line 9 is returning 0 for jpegs, 1 for pngs, and 1 for layer groups. How would I tell the difference between a single layer in a png file and a layer group? I'm probably missing something very simple here.

Code:

   # make sure drawable is a layer
   drawable_type = pdb.gimp_drawable_type(drawable)
   if drawable_type != 0 and drawable_type != 1:
       pdb.gimp_message(drawable_type)
       pdb.gimp_message("Please select a layer")
       return