将字符串添加到线程名称的末尾

Question

我正在使用日志模块打印一些数据。这是我的代码：

logging.basicConfig(
    format="%(asctime)s [%(threadName)s] [%(levelname)s]  %(message)s",
    level=logging.INFO,
    handlers=[
        logging.FileHandler("{0}/{1}.log".format(logPath, fileName)),
        logging.StreamHandler(sys.stdout)
    ]
)

我想将一些数据附加到线程名称的末尾，如下所示：

2018-10-30 19:43:54,304 [Thread-2 %SOME INFO%] [WARNING] Foo bar baz

我该怎么做？

Answer 1

Logger class 的 "log" 方法（调试，信息，警告，...）可以接受一个 extra 参数，它是一个字典，可以是用作自定义属性。 documentation 表示：

The second keyword argument is extra which can be used to pass a dictionary which is used to populate the __dict__ of the LogRecord created for the logging event with user-defined attributes. These custom attributes can then be used as you like. For example, they could be incorporated into logged messages.

在您的示例中，我们必须在 format 属性中添加新信息：

logging.basicConfig(
    format="%(asctime)s [%(threadName)s %(threadInfo)s] [%(levelname)s]  %(message)s",
    level=logging.INFO,
    handlers=[
        logging.FileHandler("{0}/{1}.log".format(logPath, fileName)),
        logging.StreamHandler(sys.stdout)
    ]
)

我们可以这样调用日志方法：

logging.info("Foo bar baz", extra={'threadInfo': 'SOME INFO'})

将字符串添加到线程名称的末尾

Add string to end of thread name

python

python-multithreading

python-3.x