Index: pyext/IMP.i
===================================================================
--- pyext/IMP.i	(revision 647)
+++ pyext/IMP.i	(working copy)
@@ -84,7 +84,8 @@
   %template(ResidueType) Key<ResidueTypeTag>;     
   %template(show_named_nierarchy) show<NameDecorator>;
   %template(show_molecular_hierarchy) show<MolecularHierarchyDecorator>;
-  %template(ParticleVector) ::std::vector<Particle*>;       
+  %template(Particles) ::std::vector<Particle*>;       
+  %template(ParticleIndexes) ::std::vector<ParticleIndex>;       
   %template(FloatKeys) ::std::vector<FloatKey>;
   %template(StringKeys) ::std::vector<StringKey>;
   %template(IntKeys) ::std::vector<IntKey>;
Index: test/distance/test_distance.py
===================================================================
--- test/distance/test_distance.py	(revision 647)
+++ test/distance/test_distance.py	(working copy)
@@ -9,7 +9,7 @@
         """Set up model and particles"""
 
         self.imp_model = IMP.Model()
-        self.particles = []
+        self.particles = IMP.Particles()
         self.rsrs = []
 
         # create particles 0 - 1