contextmanager在日志记录中失败

Question

我试图编写一个锁功能，使我的脚本只有一个实例同时运行。但是，当我将调试消息或其他函数添加到代码中时，contextmanager并不喜欢。

有什么想法可以解决这个问题，用相同的功能和日志消息吗？

锁功能：

@contextmanager
def lockfile(lock_file='/run/lock/my_script.lock'):
    if os.path.exists(lock_file):
        logging.INFO('Found lock file with pid')
        lf = open(lock_file)
        pid = lf.readline()

        try:
            os.kill(pid, 0)
        except OSError:
            logging.INFO('Removing stale lock file')
            os.remove(lock_file)
        else:
            logging.INFO('Process still running. Aborting')
            sys.exit(1)

    if not os.path.exists(lock_file):
        pid = os.getpid()
        open(lock_file, 'w').write(pid)
        try:
            yield
        finally:
            os.remove(lock_file)

呼叫功能

with lockfile():
    do something

回溯：

Traceback (most recent call last):
  File "/home/vagrant/.pycharm_helpers/pydev/pydevd.py", line 1733, in <module>
    debugger.run(setup['file'], None, None)
  File "/home/vagrant/.pycharm_helpers/pydev/pydevd.py", line 1226, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/vagrant/my_script", line 274, in <module>
    with lockfile():
  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()
  File "/vagrant/my_script", line 56, in lockfile
    logging.INFO('Found lock file with pid')
TypeError: 'int' object is not callable

Answer 1

logging.INFO不是一个函数。它是一个int对象，它表示不可调用的日志记录级别。

您可能想要使用logging.info代替。

...
logging.info('Removing stale lock file')

...
logging.info('Process still running. Aborting')