code: def read_uint8(f):
      r"""
      >>> import io
      >>> read_uint8(io.BytesIO(b'\xff\x00\x00\x00\x00\x00\x00\x00'))
      255
      >>> read_uint8(io.BytesIO(b'\xff' * 8)) == 2**64-1
      True
      """
  
      data = f.read(8)
      if len(data) == 8:
          return _unpack("<Q", data)[0]
      raise ValueError("not enough data in stream to read uint8")
  
imports: import codecs
  import io
  import pickle
  import re
  import sys
  from struct import unpack
  from pickle import decode_long
label_desc: Use image node_id 5 for calling a global function with example usage: read_uint8(f) and returns: _unpack