code: def get_sha256(fp):
      hasher = hashlib.sha256()
      for chunk in iter(lambda: fp.read(8 * 1024), ""):
          hasher.update(chunk)
      return hasher.hexdigest()
  
file_path: tensorboard/tensorboard/tools/import_google_fonts.py
imports: import hashlib
  import httplib
  import os
  import re
  import sys
  import urlparse
  from absl import app
  from absl import flags
label_desc: Use image node_id 2 for calling a global function with example usage: get_sha256(fp) and returns: hasher