code: def is_gzip_file(path):
      with open(path, "rb") as f:
          magic = binascii.hexlify(f.read(2))
          return magic == b"1f8b"
  
imports: import sys
  import h2o
  from tests import pyunit_utils
  from os import path
  import binascii
label_desc: Use image node_id 1 for calling a global function with example usage: is_gzip_file(path) and returns: unknown