code: def sha256(path):
      if not os.path.exists(path):
          return None
      with open(path, "rb") as f:
          return hashlib.sha256(f.read()).hexdigest()
  
imports: import codecs
  import glob
  import hashlib
  import os
  import platform
  import re
  import subprocess
  import tarfile
  import tempfile
  import urllib.request
  from pkg_resources import parse_requirements, parse_version
  from setuptools import find_packages, setup
  from setuptools.command.build_py import build_py
  from setuptools.command.develop import develop
label_desc: Use image node_id 1 for calling a global function with example usage: sha256(path) and returns: None, hashlib