Set Default Subtype (Data Management)


Sets the default value or code for the input table's subtype.


  • The input table must contain subtype codes before setting a default code. Use the Add Subtype and Set Subtype Field tools to create subtype codes.

  • You can also view and manage subtypes in Subtypes view which can be opened by clicking the Subtypes button found in the Design section of the Data ribbon, or the by clicking the Subtypes button on the Fields view ribbon.


SetDefaultSubtype(in_table, subtype_code)
ParameterExplanationData Type

The input table or feature class whose subtype default value will be set.

Table View

The unique default value for a subtype.


Derived Output

NameExplanationData Type

The updated table or feature class.

Table View

Code sample

SetDefaultSubtype example (Python window)

The following Python window script demonstrates how to use the SetDefaultSubtype function in immediate mode.

import arcpy
arcpy.env.workspace = "C:/data/Montgomery.gdb"
arcpy.SetDefaultSubtype_management("water/fittings", 5)
Set Default Subtype Example 2 (Stand-alone Script)

The following stand-alone script demonstrates how to use the SetDefaultSubtype function as part of a workflow to add subtypes to a field.

# Purpose: Create a subtype definition

# Import system modules
import arcpy
# Set the workspace (to avoid having to type in the full path to the data every time)
arcpy.env.workspace =  "C:/data/Montgomery.gdb"
# Set local parameters
inFeatures = "water/fittings"
# Process: Set Subtype Field...
arcpy.SetSubtypeField_management(inFeatures, "TYPECODE")
# Process: Add Subtypes...
# Store all the suptype values in a dictionary with the subtype code as the "key" and the 
# subtype description as the "value" (stypeDict[code])
stypeDict = {"0": "Unknown", "1": "Bend", "2": "Cap", "3": "Cross", 
             "4": "Coupling", "5": "Expansion joint", "6": "Offset", "7": "Plug", 
             "8": "Reducer", "9": "Saddle", "10": "Sleeve", "11": "Tap", "12": "Tee", 
             "13": "Weld", "14": "Riser"} 

# Use a for loop to cycle through the dictionary
for code in stypeDict:
    arcpy.AddSubtype_management(inFeatures, code, stypeDict[code])     
# Process: Set Default Subtype...
arcpy.SetDefaultSubtype_management(inFeatures, "4")

Licensing information

  • Basic: Yes
  • Standard: Yes
  • Advanced: Yes

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