code: def _read_u32(file):
      x = 0
      for i in range(4):
          byte = file.read(1)
          if not byte:
              raise EOFError
          x = x * 256 + ord(byte)
      return x
  
imports: from collections import namedtuple
  import warnings
label_desc: Use image node_id 1 for calling a global function with example usage: _read_u32(file) and returns: x