Summary
The Describe function returns the following properties for Geometric Networks. Dataset Properties are also supported.
A Geometric Network returns a dataType of "GeometricNetwork".
Properties
| Property | Explanation | Data Type | 
| featureClassNames (Read Only) | A Python List of the feature classes participating in the Geometric Network | String | 
| networkType (Read Only) | The type of associate logical network 
 | String | 
| orphanJunctionFeatureClassName (Read Only) | The name of the feature class that contains the Orphan Junction features | String | 
Code sample
The following stand-alone script displays properties for a geometric network.
import arcpy
# Create a Describe object from the geometric network.
#
desc = arcpy.Describe("C:/data/wellingham.gdb/water/water_Net")
# Print some geometric network properties
#
print "NetworkType:                    " + desc.networkType
print "OrphanJunctionFeatureClassName: " + \
    desc.orphanJunctionFeatureClassName
print "Feature Class Names:"
for fcname in desc.featureClassNames:
    print "  " + fcname