python不会将文件句柄释放到日志文件 [英] python does not release filehandles to logfile

问题描述

我有一个必须运行许多模拟运行的应用程序.我想设置一个日志记录机制，其中所有日志记录都记录在general.log中，而所有用于模拟运行的日志都进入run00001.log，....为此，我定义了一个Run类.在__init__()中，为运行日志添加了一个新的文件句柄.

I have an application which has to run a number of simulation runs. I want to setup a logging mechanisme where all logrecords are logged in a general.log, and all logs for a simulation run go to run00001.log, .... For this I have defined a class Run. in the __init__() a new filehandle is added for the runlog.

问题在于，运行的日志文件永远不会释放，因此，在运行了许多运行之后，可用句柄就用光了，运行崩溃了.

The problem is that the logfiles for the runs never get released, so after a number of runs the available handles are exhausted and the run crashes.

我已经设置了一些例程来对此进行测试，如下所示:

I've set up some routines to test this as follows

主程序

import Model
try:
    myrun = Model.Run('20130315150340_run_49295')
    ha = raw_input('enter')
    myrun.log.info("some info")
except:
    traceback.print_exc(file=sys.stdout)

ha = raw_input('enter3')

Run类在模块Model中定义如下

The class Run is defined in module Model as follows

import logging
class Run(object):

    """ Implements the functionality of a single run. """
    def __init__(self, runid):
        self.logdir="."
        self.runid          = runid
        self.logFile        = os.path.join(self.logdir , self.runid + '.log')
        self.log            = logging.getLogger('Run'+self.runid)
        myformatter         = logging.Formatter('%(asctime)s %(name)-12s %(levelname)-8s %(message)s')
        myhandler      = logging.FileHandler(self.logFile)
        myhandler.setLevel(logging.INFO)
        myhandler.setFormatter(myformatter)
        self.log.addHandler(myhandler) 

然后，我使用程序进程浏览器来跟踪文件处理程序.而且我看到运行日志出现了，但从未消失.

Then I use the program process explorer to follow the filehandlers. And I see the runlogs appear, but never disappear.

有没有办法强制执行此操作?

Is there a way I can force this?

推荐答案

您需要在文件处理程序上调用.close().

You need to call .close() on the filehandler.

Run类完成后，请致电:

handlers = self.log.handlers[:]
for handler in handlers:
    handler.close()
    self.log.removeHandler(handler)

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