from fractal_input import InputHandler, DatetimeNode, ListNode

  class UserHandler(InputHandler):
      def define(self):
          user = self.add('user', User)
          user.add('name', 'string')
          user.add('email', 'string')
          user.add('age', 'integer', {'required': False})
          user.add('createdAt', DatetimeNode('%m/%d/%y %H:%M:%S'))

          address = user.add('address', Address)
          address.add('street', 'string')

          telephone = user.add('telephones', ListNode(Telephone))
          telephone.add('number', 'string')

dict_data = {
  'user': {
    'name': 'James',
    'email': '[email protected]',
    'age': 20
  }
}

input = UserHandler()
input.bind(dict_data)

if not input.is_valid():
  print(input.get_error_as_string())

user = input.get_data()['user']