code: def highest_pickle_protocol(python_versions):
      protocol = 4
      for version in python_versions:
          if version[0] == 2:
              # The minimum protocol version for the versions of Python that we
              # support (2.7 and 3.3+) is 2.
              return 2
          if version[1] < 4:
              protocol = 3
      return protocol
  
imports: import errno
  import sys
  import os
  import re
  import pkgutil
  import warnings
  import inspect
  import subprocess
  import ast
label_desc: Use image node_id 15 for calling a global function with example usage: highest_pickle_protocol(python_versions) and returns: protocol, int