old_contents: from __future__ import print_function, division
  
  from sympy.core.basic import Basic
  from sympy.logic.boolalg import And, Or, Not, true, false
  from sympy.sets.sets import (Set, Interval, Intersection, EmptySet, Union,
                               FiniteSet)
  from sympy.core.singleton import Singleton, S
  from sympy.core.sympify import _sympify
  from sympy.core.decorators import deprecated
  from sympy.core.function import Lambda
  
  
  class ConditionSet(Set):
      """
      Set of elements which satisfies a given condition.
  
      {x | condition(x) is True for x in S}
  
      Examples
      ========
  
      >>> from sympy import Symbol, S, ConditionSet, Lambda, pi, Eq, sin, Interval
      >>> x = Symbol('x')
      >>> sin_sols = ConditionSet(Lambda(x, Eq(sin(x), 0)), Interval(0, 2*pi))
      >>> 2*pi in sin_sols
      True
      >>> pi/2 in sin_sols
      False
      >>> 3*pi in sin_sols
      False
      >>> 5 in ConditionSet(Lambda(x, x**2 > 4), S.Reals)
      True
      """
      def __new__(cls, lamda, base_set):
          return Basic.__new__(cls, lamda, base_set)
  
      condition = property(lambda self: self.args[0])
      base_set = property(lambda self: self.args[1])
  
      def contains(self, other):
          return And(self.condition(other), self.base_set.contains(other))
  
new_contents: from __future__ import print_function, division
  
  from sympy.core.basic import Basic
  from sympy.logic.boolalg import And, Or, Not, true, false
  from sympy.sets.sets import (Set, Interval, Intersection, EmptySet, Union,
                               FiniteSet)
  from sympy.core.singleton import Singleton, S
  from sympy.core.sympify import _sympify
  from sympy.core.decorators import deprecated
  from sympy.core.function import Lambda
  
  
  class ConditionSet(Set):
      """
      Set of elements which satisfies a given condition.
  
      {x | condition(x) is True for x in S}
  
      Examples
      ========
  
      >>> from sympy import Symbol, S, ConditionSet, Lambda, pi, Eq, sin, Interval
      >>> x = Symbol('x')
      >>> sin_sols = ConditionSet(Lambda(x, Eq(sin(x), 0)), Interval(0, 2*pi))
      >>> 2*pi in sin_sols
      True
      >>> pi/2 in sin_sols
      False
      >>> 3*pi in sin_sols
      False
      >>> 5 in ConditionSet(Lambda(x, x**2 > 4), S.Reals)
      True
      """
      def __new__(cls, condition, base_set):
          return Basic.__new__(cls, condition, base_set)
  
      condition = property(lambda self: self.args[0])
      base_set = property(lambda self: self.args[1])
  
      def contains(self, other):
          return And(self.condition(other), self.base_set.contains(other))
  
subject: Fix naming in ConditionSet