code: def check_sizeof(self, format_str, number_of_codes):
      # The size of 'PyStructObject'
      totalsize = support.calcobjsize("2n3P")
      # The size taken up by the 'formatcode' dynamic array
      totalsize += struct.calcsize("P3n0P") * (number_of_codes + 1)
      support.check_sizeof(self, struct.Struct(format_str), totalsize)
  
imports: from collections import abc
  import array
  import gc
  import math
  import operator
  import unittest
  import struct
  import sys
  import weakref
  from test import support
  from test.support import import_helper
  from test.support.script_helper import assert_python_ok
label_desc: Use image node_id 19 for calling the StructTest obj's underlying member method code with example usage: obj.check_sizeof(format_str, number_of_codes) without return types