human
Solve the following python programming problem given the following code:
@ gen.engine 
def GetMergedLogsFileList(merged_store, logs_paths, marker, callback) : 
    'Fetch the list of file names from S3.' 
    registry_file = logs_paths.ProcessedRegistryPath () 
    def _WantFile(filename) : 
        if (filename == registry_file) : 
            return False 
instance = logs_paths.MergedLogPathToInstance (filename) 
        if (instance is None) : 
            logging.error (('Could not extract instance from file name %s' % filename)) 
            return False 
return ((not options.options.ec2_only) or logs_util.IsEC2Instance (instance)) 
base_path = logs_paths.MergedDirectory () 
    marker = (os.path.join (base_path, marker) if (marker is not None) else None) 
    file_list = (yield gen.Task (store_utils.ListAllKeys, merged_store, prefix = base_path, marker = marker)) 
    files = [f for f in file_list if _WantFile (f)] 
    files.sort () 
    logging.info (('found %d merged log files, analyzing %d' % (len (_WantFile), len (files)))) 
    callback (files) 

    
    

    Fix the buggy line: logging.info (('found %d merged log files, analyzing %d' % (len (_WantFile), len (files))))
assistant
#Here is Python code to fix the buggy line: logging.

logging.info (('found %d merged log files, analyzing %d' % (len (file_list), len (files))))