code: def test_jpeg1(h, f):
      """JPEG data in JFIF format"""
      if b"JFIF" in h[:23]:
          return "jpeg"
  
file_path: ydata-profiling/src/ydata_profiling/utils/common.py
imports: import collections.abc
  import zipfile
  from datetime import datetime, timedelta
  from imghdr import tests
  from pathlib import Path
  from typing import Mapping
label_desc: Use image node_id 4 for calling a global function with example usage: test_jpeg1(h, f) and returns: str