import lollipop.types as lt
import lollipop.validators as lv

EMAIL_REGEXP = r"^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$"

USER = lt.Object({
    'name': lt.String(validate=lv.Length(min=1)),
    'email': lt.String(validate=lv.Regexp(EMAIL_REGEXP)),
    'age': lt.Optional(lt.Integer(validate=lv.Range(min=18))),
}, name='User', description='User information')

from lollipop_jsonschema import json_schema
import json

print json.dumps(json_schema(USER), indent=2)
# {
#   "title": "User",
#   "description": "User information",
#   "type": "object",
#   "properties": {
#     "age": {
#       "type": "integer",
#       "minimum": 18
#     },
#     "name": {
#       "type": "string",
#       "minLength": 1
#     },
#     "email": {
#       "type": "string",
#       "pattern": "^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+$"
#     }
#   },
#   "required": [
#     "name",
#     "email"
#   ]
# }