I have developed the python script for Compress ,Rebuild Indexes and Analyze datasets. For that I am getting the list of feature classes using arcpy.ListFeatureclasses() function.It is working in ArcGIS10.2.1 (Python IDLE 2.7.5).It gives propoer results.The same code was executed in ArcGIS10.3.1(Python IDLE 2.7.8).It was not executed and not giving the results.Please help me on this.