code: def update_hash(src_file):
      
      hash_file = local.path(src_file) + ".hash"
      new_hash = 0
      with open(hash_file, 'w') as h_file:
          new_hash = get_hash_of_dirs(src_file)
          h_file.write(str(new_hash))
      return new_hash
docs: Update the hash for the given file.
  
      Args:
          src: The file name.
          root: The path of the given file.