code: def test_nu_to_lambda():
      assert_equal(sc.nu2lambda(1), sc.speed_of_light)
  
imports: from __future__ import division, print_function, absolute_import
  from numpy.testing import assert_equal, assert_allclose
  import scipy.constants
label_desc: Use image node_id 3 for calling a global function with example usage: test_nu_to_lambda() without return types