10 print "<<< ref#(atrack)=", sys.getrefcount(atrack)
 
   13 astep= atrack.GetStep1()
 
   14 print "<<< ref#(atrack, astep)=",\
 
   15       sys.getrefcount(atrack),\
 
   16       sys.getrefcount(astep)
 
   18 print "<<< delete astep" 
   19 print "<<< ref#(atrack)=", sys.getrefcount(atrack)
 
   22 bstep= atrack.GetStep1()
 
   24 print "<<< previous step is still remain?" 
   27 print "--- stderr ---"