code: def run_test(rep, msg, func, arg):
      items = range(rep)
      from time import perf_counter as clock
  
      start = clock()
      for i in items:
          func(arg)
          func(arg)
          func(arg)
          func(arg)
          func(arg)
      stop = clock()
      print("%20s: %.2f us" % (msg, ((stop - start) * 1e6 / 5 / rep)))
  
file_path: cpython/Lib/test/test_ctypes/test_strings.py
imports: import unittest
  from ctypes import create_string_buffer, create_unicode_buffer, sizeof, byref, c_char, c_wchar
label_desc: Use image node_id 1 for calling a global function with example usage: run_test(rep, msg, func, arg) without return types