Summary
Lists the attribute domains belonging to a geodatabase.
Syntax
ListDomains (workspace)
| Parameter | Explanation | Data Type | 
| workspace | A geodatabase. | String | 
Code sample
List and describe all the workspace domains.
import arcpy
domains = arcpy.da.ListDomains("C:/Boston/Boston.gdb")
for domain in domains:
    print('Domain name: {0}'.format(domain.name))
    if domain.domainType == 'CodedValue':
        coded_values = domain.codedValues
        for val, desc in coded_values.items():
            print('{0} : {1}'.format(val, desc))
    elif domain.domainType == 'Range':
        print('Min: {0}'.format(domain.range[0]))
        print('Max: {0}'.format(domain.range[1]))