Adding spatial reference to many shapefiles in loop using ArcPy?

Question

AST folder has 5 shapefiles. This code tries to pass the 2100 coordinate system to these shapefiles. But it gives error 999999:

arcpy.env.workspace = r"C:\Users\user\Desktop\roads\AST" 
for i in arcpy.ListFeatureClasses():
     sr = arcpy.SpatialReference("EPSG:2100")
     arcpy.DefineProjection_management(i, sr)

How to make it work?

Answer 1

Instead of:

sr = arcpy.SpatialReference("EPSG:2100")

try:

sr = arcpy.SpatialReference(2100)

Do ArcGIS SpatialReference object factory codes correspond with EPSG numbers? is worth reviewing for information about using EPSG codes in ArcMap.