code: def check_entropy(distfn, arg, msg):
      ent = distfn.entropy(*arg)
      npt.assert_(not np.isnan(ent), msg + "test Entropy is nan")
  
imports: import pickle
  import numpy
  import numpy.testing
  from numpy.testing import assert_allclose, assert_equal
  from pytest import raises
  import numpy.ma.testutils
  from scipy._lib._util import getfullargspec_no_self
  from scipy import stats
label_desc: Use image node_id 8 for calling a global function with example usage: check_entropy(distfn, arg, msg) without return types