code: def _replacer(x):
      
      # get the hex repr of the binary char and remove 0x and pad by pad_size
      # zeros
      try:
          hexin = ord(x)
      except TypeError:
          # bytes literals masquerade as ints when iterating in py3
          hexin = x
  
      return hex(hexin)
docs: Replace a number with its hexadecimal representation. Used to tag
      temporary variables with their calling scope's id.