code: def test_saxpy4(self):
      code = """
  def saxpy4(a, x, y):
      return manual(y,x,a)
  def manual(y,x,a):
      __list=list()
      for __tuple in zip(y,x):
          __list.append(__tuple[0]*a+__tuple[1])
      return __list
  """
      self.run_test(
          code,
          1.5,
          [1, 2, 3],
          [0.0, 2.0, 4.0],
          saxpy4=[float, List[int], List[float]],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import *
label_desc: Use image node_id 4 for calling the TestCopperhead obj's underlying member method code with example usage: obj.test_saxpy4() without return types