code: def test_float(self):
      # only almost equal: double -> float -> double
      import math
  
      self.check_type(c_float, math.e)
      self.check_type(c_float, -math.e)
  
imports: import functools
  import unittest
  from ctypes import *
  from ctypes.test import need_symbol
  import _ctypes_test
label_desc: Use image node_id 13 for calling the Callbacks obj's underlying member method code with example usage: obj.test_float() without return types