old_contents: from ..exceptions import InvalidChoiceError
  from .base import MarathonObject
  
  
  class MarathonConstraint(MarathonObject):
      """Marathon placement constraint.
  
      See https://mesosphere.github.io/marathon/docs/constraints.html
  
      :param str field: constraint operator target
      :param str operator: must be one of [UNIQUE, CLUSTER, GROUP_BY]
      :param value: [optional] if `operator` is CLUSTER, constrain tasks to servers where `field` == `value`.
      If `operator` is GROUP_BY, place at most `value` tasks per group
      :type value: str, int, or None
      """
  
      OPERATORS = ['UNIQUE', 'CLUSTER', 'GROUP_BY']
      """Valid operators"""
  
      def __init__(self, field, operator, value=None):
          if not operator in self.OPERATORS:
              raise InvalidChoiceError('operator', operator, self.OPERATORS)
          self.field = field
          self.operator = operator
          self.value = value
  
      def __repr__(self):
          if self.value:
              template = "MarathonConstraint::{field}:{operator}:{value}"
          else:
              template = "MarathonConstraint::{field}:{operator}"
          return template.format(**self.__dict__)
  
      def json_repr(self):
          """Construct a JSON-friendly representation of the object.
  
          :rtype: list
          """
          if self.value:
              return [self.field, self.operator, self.value]
          else:
              return [self.field, self.operator]
  
      @classmethod
      def from_json(cls, obj):
          """Construct a MarathonConstraint from a parsed response.
  
          :param dict attributes: object attributes from parsed response
  
          :rtype: :class:`MarathonConstraint`
          """
          if len(obj) == 2:
              (field, operator) = obj
              return cls(field, operator)
          if len(obj) > 2:
              (field, operator, value) = obj
              return cls(field, operator, value)
  
new_contents: from ..exceptions import InvalidChoiceError
  from .base import MarathonObject
  
  
  class MarathonConstraint(MarathonObject):
      """Marathon placement constraint.
  
      See https://mesosphere.github.io/marathon/docs/constraints.html
  
      :param str field: constraint operator target
      :param str operator: must be one of [UNIQUE, CLUSTER, GROUP_BY, LIKE, UNLIKE]
      :param value: [optional] if `operator` is CLUSTER, constrain tasks to servers where `field` == `value`.
      If `operator` is GROUP_BY, place at most `value` tasks per group. If `operator`
      is `LIKE` or `UNLIKE`, filter servers using regexp.
      :type value: str, int, or None
      """
  
      OPERATORS = ['UNIQUE', 'CLUSTER', 'GROUP_BY', 'LIKE', 'UNLIKE']
      """Valid operators"""
  
      def __init__(self, field, operator, value=None):
          if not operator in self.OPERATORS:
              raise InvalidChoiceError('operator', operator, self.OPERATORS)
          self.field = field
          self.operator = operator
          self.value = value
  
      def __repr__(self):
          if self.value:
              template = "MarathonConstraint::{field}:{operator}:{value}"
          else:
              template = "MarathonConstraint::{field}:{operator}"
          return template.format(**self.__dict__)
  
      def json_repr(self):
          """Construct a JSON-friendly representation of the object.
  
          :rtype: list
          """
          if self.value:
              return [self.field, self.operator, self.value]
          else:
              return [self.field, self.operator]
  
      @classmethod
      def from_json(cls, obj):
          """Construct a MarathonConstraint from a parsed response.
  
          :param dict attributes: object attributes from parsed response
  
          :rtype: :class:`MarathonConstraint`
          """
          if len(obj) == 2:
              (field, operator) = obj
              return cls(field, operator)
          if len(obj) > 2:
              (field, operator, value) = obj
              return cls(field, operator, value)
  
subject: Add `LIKE` and `UNLIKE` constraint