code: def dev_version():
    
  
    md5_hash = hashlib.md5()
    py_files = sorted(list_files(suffix=".py"))
    if not py_files:
      return ''
    for filename in py_files:
      with open(filename, 'rb') as fobj:
        content = fobj.read()
      md5_hash.update(content)
    return md5_hash.hexdigest()
docs: Returns a hexdigest of all the python files in the module.