code: def test_struct_field_alignment(self):
      # standard packing in struct uses no alignment.
      # So, we have to align using pad bytes.
      #
      # Unaligned accesses will crash Python (on those platforms that
      # don't allow it, like sparc solaris).
      if sys.byteorder == "little":
          base = BigEndianStructure
          fmt = ">bxhid"
      else:
          base = LittleEndianStructure
          fmt = "<bxhid"
  
      class S(base):
          _fields_ = [
              ("b", c_byte),
              ("h", c_short),
              ("i", c_int),
              ("d", c_double),
          ]
  
      s1 = S(0x12, 0x1234, 0x12345678, 3.14)
      s2 = struct.pack(fmt, 0x12, 0x1234, 0x12345678, 3.14)
      self.assertEqual(bin(s1), bin(s2))
  
imports: import binascii
  import ctypes
  import math
  import struct
  import sys
  import unittest
  from ctypes import Structure, Union, LittleEndianUnion, BigEndianUnion, BigEndianStructure, LittleEndianStructure, POINTER, sizeof, cast, c_byte, c_ubyte, c_char, c_wchar, c_void_p, c_short, c_ushort, c_int, c_uint, c_long, c_ulong, c_longlong, c_ulonglong, c_uint32, c_float, c_double
label_desc: Use image node_id 10 for calling the Test obj's underlying member method code with example usage: obj.test_struct_field_alignment() without return types