human
Solve the following python programming problem given the following code:
def _patchTextFileLogObserver(patch) : 
    '
    Patch L{logger.textFileLogObserver} to record every call and keep a
    reference to the passed log file for tests.

    @param patch: a callback for patching (usually L{unittest.TestCase.patch}).

    @return: the list that keeps track of the log files.
    @rtype: C{list}
    ' 
    logFiles = [] 
    oldFileLogObserver = logger.textFileLogObserver 
    def observer(logFile, * args, **kwargs) : 
        logFiles.append (logFile) 
        return oldFileLogObserver (logFile, * args, ** kwargs) 
patch (logger, 'textFileLogObserver', logFiles) 
    return logFiles 

    
    

    Fix the buggy line: patch (logger, 'textFileLogObserver', logFiles)
assistant
#Here is Python code to fix the buggy line: patch (logger, 'textFileLogObserver', logFiles)
.

patch (logger, 'textFileLogObserver', def observer()