There is a good sample on the resource center that will list all the fields, their default value, and any domain assigned.
import arcpy
fc = <FeatureClass>
subtypes = arcpy.da.ListSubtypes(fc)
for stcode, stdict in subtypes.iteritems():
print('Code: {0}'.format(stcode))
for stkey in stdict.iterkeys():
if stkey == 'FieldValues':
print('Fields:')
fields = stdict[stkey]
for field, fieldvals in fields.iteritems():
print(' --Field name: {0}'.format(field))
print(' --Field default value: {0}'.format(fieldvals[0]))
if not fieldvals[1] is None:
print(' --Domain name: {0}'.format(fieldvals[1].name))
else:
print('{0}: {1}'.format(stkey, stdict[stkey]))However, if you are only interested in a list of all the domains used within the subtype, we can just list the domains using a similar code:
import arcpy
fc = <FeatureClass>
subtypes = arcpy.da.ListSubtypes(fc)
for stcode, stdict in subtypes.iteritems():
print('Code: {0}'.format(stcode))
for stkey in stdict.iterkeys():
if stkey == 'FieldValues':
print('Fields with Domains:')
fields = stdict[stkey]
for field, fieldvals in fields.iteritems():
if not fieldvals[1] is None:
print(' --Field name: {0}'.format(field))
print(' --Domain name: {0}\n'.format(fieldvals[1].name))
else:
print('{0}: {1}'.format(stkey, stdict[stkey]))Output:
Code: 1
Default: True
Name: Metal Pipe
SubtypeField: SubTypeCD
Fields:
--Field name: InletWallThickness
--Domain name: fcNumericWallThickness
--Field name: Material
--Domain name: fcMetalMaterial
--Field name: PipeDistributor
--Domain name: fcPipeDistributor
