text: from mongoset.database import Expression
  
  
  def gt(val):
      return Expression("$gt", val)
  
  
  def gte(val):
      return Expression("$gte", val)
  
  
  def lt(val):
      return Expression("$lt", val)
  
  
  def lte(val):
      return Expression("$lte", val)
  
  
  def ne(val):
      return Expression("$ne", val)
  
  
  def in_list(*elements):
      return Expression("$in", elements)
  
  
  def not_in_list(*elements):
      return Expression("$nin", elements)
  