adding function that only make real parts of data to show, works good for index

Signed-off-by: Taeyoung Kim <taeyoung.kim@eonerc.rwth-aachen.de>

examples/quickstart/run_nv_powerflow.log

@@ -76,6 +76,6 @@ INFO:cimpy.cimimport:CIM object Line created : 11 times
 INFO:cimpy.cimimport:CIM object SubGeographicalRegion created : 2 times
 INFO:cimpy.cimimport:CIM object BusbarSection created : 13 times
 INFO:cimpy.cimimport:CIM object TopologicalIsland created : 2 times
-INFO:cimpy.cimimport:Created totally 275 CIM objects in 0.02373528480529785s
+INFO:cimpy.cimimport:Created totally 275 CIM objects in 0.027223825454711914s