from jsonlint import Json
from jsonlint.fields import StringField
from jsonlint.validators import DataRequired
class MyLint(Json):
 name = StringField(validators=[DataRequired()])
mylint = MyLint({'name': 'demo'})
print mylint.validate() # True
print mylint.name.data # demo

from jsonlint import Json
from jsonlint.fields import IntegerField
from jsonlint.validators import ValidationError
class AgeLint(Json):
 age = IntegerField()
 def validate_age(form, field):
  if field.data < 13:
   raise ValidationError("We're sorry, you must be 13 or older to register")
agelint = AgeLint({'age': 12})
print agelint.validate() # False
print agelint.age.errors # ["We're sorry, you must be 13 or older to register"]

from jsonlint import Json
from jsonlint.fields import StringField, ListField
from jsonlint.validators import DataRequired, ValidationError
class ListLint(Json):
 cars = ListField(StringField(validators=[DataRequired()]))
 def validate_cars(form, field):
  if 'BMW' in field.data:
   raise ValidationError("We're sorry, you cannot drive BMW")
listlint = ListLint({'cars': ['Benz', 'BMW', 'Audi']})
print listlint.validate() # False
print listlint.cars.errors # ["We're sorry, you cannot drive BMW"]

from jsonlint import Json
from jsonlint.fields import ObjectField, IntegerField, BooleanField
class T(Json):
 status = BooleanField()
 code = IntegerField()
class DataLint(Json):
 data = ObjectField(T)
datalint = DataLint({'data': {'status': True, 'code': 200}})
print datalint.validate() # False
print datalint.data.code.data # 200

class RegisterLint(UserLint):
 def validata_nickname(self, field):
  ...
 def validate_account(self, field):
  ...
 def create_user(self):
  ...
user = RegisterLint()

pip install jsonlint