old_contents: from math import fmod
  
  
  def byte_pad(input_bytes, length=8):
      if length > 256:
          raise ValueError("Maximum padding length is 256")
  
      # Modulo input bytes length with padding length to see how many bytes to pad with
      bytes_to_pad = int(fmod(len(input_bytes), length))
  
      # Pad input bytes with a sequence of bytes containing the number of padded bytes
      input_bytes += bytes([bytes_to_pad] * bytes_to_pad)
  
      return input_bytes
  
  
  def strip_byte_padding(input_bytes, length=8):
      if fmod(len(input_bytes), length) != 0:
          raise ValueError("Input byte length is not divisible by %s " % length)
  
      # Get the last {length} bytes of the input bytes, reversed
      byte_block = bytes(input_bytes[:length:-1])
  
      # If input bytes is padded, the padding is equal to byte value of the number
      # of bytes padded. So we can read the padding value from the last byte..
      padding_byte = byte_block[0:1]
  
      for i in range(1, ord(padding_byte)):
          if byte_block[i:i+1] != padding_byte:
              return input_bytes
  
      return input_bytes[0:-ord(padding_byte)]
  
new_contents: from math import fmod
  
  
  def byte_pad(input_bytes, length=8):
      if length > 256:
          raise ValueError("Maximum padding length is 256")
  
      # Modulo input bytes length with padding length to see how many bytes to pad with
      bytes_to_pad = int(fmod(len(input_bytes), length))
  
      # Pad input bytes with a sequence of bytes containing the number of padded bytes
      input_bytes += bytes([bytes_to_pad] * bytes_to_pad)
  
      return input_bytes
  
  
  def strip_byte_padding(input_bytes, length=8):
      if fmod(len(input_bytes), length) != 0:
          raise ValueError("Input byte length is not divisible by %s " % length)
  
      # Get the last {length} bytes of the input bytes, reversed
      byte_block = bytes(input_bytes[:length:-1])
  
      # If input bytes is padded, the padding is equal to byte value of the number
      # of bytes padded. So we can read the padding value from the last byte..
      padding_byte = byte_block[0:1]
  
      for i in range(1, ord(padding_byte.decode())):
          if byte_block[i:i+1] != padding_byte:
              return input_bytes
  
      return input_bytes[0:-ord(padding_byte.decode())]
  
subject: Convert byte to string before using it with ord()