code: def hex_str(an_int):
      """Convert an int to an hexadecimal string."""
      return "{0:#x}".format(an_int)
  
imports: import pickle
  import os
  import zlib
  from io import BytesIO
  from ._compat import PY3_OR_LATER
  from .numpy_pickle_utils import _ZFILE_PREFIX
  from .numpy_pickle_utils import Unpickler
label_desc: Use image node_id 1 for calling a global function with example usage: hex_str(an_int) and returns: str