def obtain_saved_objects(file_name):
 net_devices = {}
 if (not os.path.isfile(file_name)):
  return {}
 if (file_name.count('.') == 1):
  (_, out_format) = file_name.split('.')
 else:
  raise ValueError('Invalid file name: {0}'.format(file_name))
 if (out_format == 'pkl'):
  with open(file_name, 'r') as f:
   while True:
    try:
     net_devices = pickle.load(f)
    except EOFError:
     break
 elif (out_format == 'yml'):
  with open(file_name, 'r') as f:
   net_devices = yaml.load(f)
 elif (out_format == 'json'):
  with open(file_name, 'r') as f:
   net_devices = json.load(f)
   for (device_name, device_attrs) in net_devices.items():
    (uptime, last_changed, run_config_changed) = device_attrs
    tmp_device = NetworkDevice(uptime, last_changed, run_config_changed)
    net_devices[device_name] = tmp_device
 else:
  raise ValueError('Invalid file name: {0}'.format(file_name))
 return net_devices

def obtain_saved_objects ( file_name ) : net_devices = { } if ( not os . path . isfile ( file_name ) ) : return { } if ( file_name . count ( '.' ) == 1 ) : ( _ , out_format ) = file_name . split ( '.' ) else : raise ValueError ( 'Invalid file name: {0}' . format ( file_name ) ) if ( out_format == 'pkl' ) : with open ( file_name , 'r' ) as f : while True : try : net_devices = pickle . load ( f ) except EOFError : break elif ( out_format == 'yml' ) : with open ( file_name , 'r' ) as f : net_devices = yaml . load ( f ) elif ( out_format == 'json' ) : with open ( file_name , 'r' ) as f : net_devices = json . load ( f ) for ( device_name , device_attrs ) in net_devices . items ( ) : ( uptime , last_changed , run_config_changed ) = device_attrs tmp_device = NetworkDevice ( uptime , last_changed , run_config_changed ) net_devices [ device_name ] = tmp_device else : raise ValueError ( 'Invalid file name: {0}' . format ( file_name ) ) return net_devices
read in previously saved objects from a pickle file returns a dict: device_name: device_object .