skyfw@localhost ~/code/savior $ ./State.py
Package rdeps: 
<class 'portage.ebuild.conditionals.DepSet'>
Traceback (most recent call last):
  File "./State.py", line 18, in ?
    mygraph.add_pkg( pkg )
  File "/home/skyfw/code/svn/savior/portage/graph/state_graph.py", line 24, in add_pkg
    self.pkgs[pkg] = (combinations(pkg.rdepends), sets.Set(), sets.Set())
  File "/home/skyfw/code/svn/savior/portage/graph/state_graph.py", line 190, in combinations
    if isinstance(restrict, OrRestriction):
TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types