i2

  > [10, 1, 5, 1, 10, 10, 1, 5, 5, 5, 10].sort(byNum)
  > [10, 10, 5, 1, 10, 1, 1, 5, 5, 5, 10]

  > function byNum(a, b) { return a - b; }

  >>> ZERO = lambda f: lambda x: x
  >>> FIVE = lambda f: lambda x: f(f(f(f(f(x)))))
  >>> to_int = lambda f: f(lambda x: x+1)(0)
  ... etc.

  collection = Transaction.search(
      order_id__starts_with='a2d',
      customer_website__ends_with='.com',
      billing__first_name__exact='John',
      status__in=[
        Transaction.Status.Authorized,
        Transaction.Status.Settled
      ],
      amount__between=("10.00", "20.00")
  )

  def search(**kwargs):
      for arg, value in kwargs.items():
          action = arg.split('__')
          attr = getattr(self, action[0])
          if len(action) == 2:
              method = getattr(attr, action[1])
              method(value)
          etc.
          .....